I think this is a hand that should be calling or folding to the 3bet.

If we're calling 3bets here ever, I think KQ should be in the calling range.

Assuming he's defending with a reasonable range, KQ is too good to 4bet/fold but too bad to 4bet/call. We can raise a certain range, but it should be hands that are significantly better than KQ (stack off hands) and hands that can easily fold if he shoves.

I wrote the above before really reading your analysis. The thing that sticks out at me is that he's 10-15 tabling 50nl FR. Even if he's a hudbot he's probably not 3betting super-light. I give him credit until I see a reason not to.