[Trivial]

I think the hardest thing here is, since the BB is in such an obvious squeeze spot, the natural inclination is for the original PFR (esp. from UTG) to re-raise with most of their range, so when the BB actually has a hand (say AQ+ , TT+) he will feel compelled to shove it in since the majority of the time he has nothing in that spot, so he needs to push harder when he's at the top end of his range. So maybe we have to 4bet and call a shove, even though 5bet shoving AK would normally suck for 140bbs from the opponent's perspective, unless you yourself have been particularly active.

Giving a tight range of AKs/AKo,JJ+ in Pokerstove we have 36.5% equity if he shoves which makes 4betting and calling about right, so obviously if you think he's getting it in wider than that (and always shoves AK) then this line is fine.