You're definitely right to say that we need to be cautious. But we can't be so cautious that we just throw the hermeneutical and exegetical possibilities to the wind simply because we find some notion or story within the Old Testament distasteful to our modern moral inclinations.
Before comparing notes and sources, I'd say that the main point here in typological comparisons is to realize that some Old Testaments events are only typological in some minor form, thematically speaking, but not in substance.
The instance of Samson, then, is that his story is only typological in the sense where he was used by God and defeating the "enemies of God" and by doing so, he stretching out his arms are brought down one powercenter in the misdirections of paganism. Robert Hampshire describes some additional nuances that MIGHT BE (and I say "might be") at play in the typological meaning of Samson.
That is why we needed Jesus Christ to come and save us: Because we could not save ourselves. We also see in Samson’s story the crucial lesson that God will ultimately be glorified, even if it is through our mistakes and blunders.
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Scott McKnight says otherwise:
Samson is mentioned in two places in Scripture. The first is the story of Samson in Judges 13-16. The only other mention is in Hebrews 12 among a list of other Old Testament characters.And what more shall ...
www.christianitytoday.com
The caveat in this is that I'm very, very aware of the violence aspect of this which is prominent as a part of the Samson narrative in the book of
Judges, so that issue in and of itself needs to be assessed and addressed as a part of any typological or allegorical analysis that might be made of Samson (or of any other figure or event in the Old Testament). In such case, I'd bring in a number of additional sources--but not end with those--in order to better think through these "types."