You're basically asking how do we determine the truth of the matter.  For one thing, we need to use other scripture to help us, which I don't see you doing here.  The decision is impossible based on these texts alone, so you have to look at other scripture as well.  Should our doctrine be founded on undeniably difficult to interpret scripture like we find in a majority of the book of Revelation or should it be founded on more clear, straightforward scripture?  The answer should be obvious.
Also, if you have a situation like this where there are two choices and you're trying to figure out which choice is correct, ask God to give you wisdom and show you (James 1:5-7).  You come across as though you rely entirely on your own human wisdom and logic to figure things out.  That's not how you should approach scripture.  We can't find the truth that way.  We can't find the truth of the deeper things of God without spiritual discernment from the Holy Spirit (1 Corinthians 2:9-14).  So, if you really want to know the truth about this then you need to establish a doctrinal foundation from more clear scripture than Revelation 18:23 and Revelation 20 and also ask God for wisdom so that you can see the truth of the matter.
		
		
	 
While I do agree we need other Scriptures to help determine this, my point basically was, though I neglected to mention some of this at the time, Revelation 18:23 indicates all nations are deceived, and that everyone other than Preterists agree Revelation 18:23 leads to the end of this age. Then we see in Revelation 20 that satan is bound so that he can deceive the nations no more. Is it then reasonable to assume that Revelation 18:23 is followed by his binding?
Then OTOH, also in Revelation 20 we see that when satan is loosed he deceives the nations again, which could mean Revelation 18:23 is meaning at the end of that rather that before the beginning of satan's binding. Therefore, is it reasonable to assume that Revelation 18:23 can be meaning at the end of satan's little season instead?
IMO, it's reasonable to assume either scenario. Of course though, both scenarios can't be true.
The way I might reason this since both scenarios can't be true, and I fully realize it's not how Amils might reason it, is like such. If Revelation 18:23 is involving deceiving all nations and that so is Revelation 20:7-9, this means the thousand years can't also be involving deceiving the nations. And that is excactly what Revelation 20:3 indicates---that he should deceive the nations no more. Which view then, Premil or Amil, would there be no nations being deceived by satan during the thousand years? Whichever view that is, has to be the correct view since it agrees with the texts involved. 
Revelation 20:7 And when the thousand years are expired, Satan shall be loosed out of his prison,
8 And shall go out to deceive the nations which are in the four quarters of the earth, Gog and Magog, to gather them together to battle: the number of whom is as the sand of the sea.
These in verse 8, the number of whom is as the sand of the sea, which view has them being deceived during the thousand years and which view doesn't? The view that does, that view contradicts Revelation 20:3--that he should deceive the nations no more while he is bound, because if they are coming against the camp of the saints after the thousand years, which proves they are not saved, and that this means they are never saved during the thousand years, thus are deceived during the thousand years instead, thus satan has been deceiving the nations during the thousand years, can't be the correct view.
The view that has, the number of whom is as the sand of the sea, deceived prior to the thousand years, then no longer deceived during the thousand years, then being deceived yet again following the thousand years, can only be the correct view. Is it possible that mortals can live an entire thousand years, assuming the thousand years are post the 2nd coming? Was it possible that Adam, a mortal himself, almost lived an entire thousand years in the beginning? If that was possible why wouldn't it be possible post the 2nd coming?
Of course though, one first has to prove there can even be any unsaved mortal survivors remaining, in light of what Revelation 19, for one, records. Hmmm.. I wonder if Zechariah 14 is also holy writ, because I'm pretty sure it records that there are indeed mortal unsaved survivors remaining post the 2nd coming. The way some try and get around that they insist nothing in Zechariah 14 involves the 2nd coming, let alone events involving a post 2nd coming era. That's fine if they disagree, but why then can't they provide an interpretation that makes better sense of the text if they feel this doesn't? 
Keep in mind that I said an interpretation that makes better sense of the text. That's not the same as saying  why then can't they provide an interpretation? The latter implies no interpretation has never been submitted ever, thus would be false, thus would be misrepresenting what I said and meant since I never said nor meant that.