If I know that a 4bet is always AAxx then I'm folding big pair hands except AAxx and calling all the hands that do well against AAxx, so most double suited run downs including one gapper hands like 79TJ etc

I agree ... I wonder how the specific hand OP was asking about does vs 4Bet range since we do block an A and not everyone 4bets only AAxx hands... is having the fourth card connected to our other 3 worth more than having an A we can hit to beat KK and a nut flush... ? Ill go run some numbers in equity softwares but not sure what Solvers would say

not sure how helpful this is ... I think we want hands that have playability post flops where we know if we can go with it or not ... dynamics must play pretty big in this I would think... as in if only AA four bets then we don't want pairs in our hands or an A
A654ds 38% vs AAxxss
50% vs KKxxss
42% vs AKKxss

7654ds 44%vs AAxxss
46% vs KKxxss
45% vs AKKxss
QQ45ds 32% vs AAxxss