Why is it too far? Jesus himself tells us that his kingdom is not of this world. Premils reject this totally.
What I have underlined is a flat out lie because you are applying that to all Premils, and not some Premils.
The problem with your kind of thinking is that you paint things with a broad brush as if what applies to one Premil applies to all Premils. For example. Some Premils are Pretribbers. Some Premils are Post tribbers. Some Premils believe Ezekiel's temple will be in the millennium with animal sacrifing continuing again. Some Premils don't believe any of that. So on and so on.
As to His kingdom not being of this world, is anyone even arguing against that? Have you not read the following parable in Luke 19? Have no Premils read this either?
Luke 19:11 And as they heard these things, he added and spake a parable, because he was nigh to Jerusalem, and because they thought that the kingdom of God should immediately appear.
12 He said therefore, A certain nobleman went into a far country to receive for himself a kingdom, and to return.
13 And he called his ten servants, and delivered them ten pounds, and said unto them, Occupy till I come.
14 But his citizens hated him, and sent a message after him, saying, We will not have this man to reign over us.
15 And it came to pass, that when he was returned, having received the kingdom, then he commanded these servants to be called unto him, to whom he had given the money, that he might know how much every man had gained by trading.
It doesn't take a rocket scientist to figure out that His kingdom is not of this world if He has to go somewhere else to obtain it, heaven in this case, then after having obtained it, returning with it in it's literal physical form.
Currently we experience it in a spiritual sense. There is no reason after He returns, regardless whether there is or isn't a millennium after His return, to still be experiencing His kingdom in the same manner we are now, that being a spiritual manner where it involves faith in things not visibly seen, as one example.
BTW, what I have underlined in the above paragraph, if you agree with that, and that I agree with that, but because I am Premil that makes me antichrist according to your way of thinking, guess what? That would make you equally antichrist as well.