That's a worthwhile consideration, but if you size your 3bet well, your opponent will call more often than he 4bets and you'll get to see that flop even when he doesn't fold. If you make it 5bb or a bit more, your opponent will have three choices:

1. Make a large 4-bet. This will mean you can't call with KQs, but it also commits him against your stack, which is great for the top of your 3-betting range and basically means that he can't make this raise without a strong hand, so you don't need to worry about it happening too often.

2. Make a small 4-bet with a wider range. Villain's 4bet would have to be quite small if he's going to leave himself room to fold to a 5-bet, and between the odds and the width of his range, I think you can justify calling such a 4-bet (if, for instance, you make it 5.2bb and he makes 11bb).

3. Call/fold. If Villain doesn't make a small 4bet with a high frequency (and if he has a high frequency for that, you can call with KQs), then he'll mostly call/fold, and you can be happy with either of those outcomes.