First, just to clarify...
1bet = limp
2bet = raise
3bet = reraise
4bet = re-reraise

I think this is correct

4-bet AK against a light 3-bet isolation range. It's not really +EV until $200NL+.
Considering most lower limit opponents have a tighter 3bet opponents than those at mid stakes (in my brief 200NL FR @ Pokerstars), this would make sense.

It's VERY tricky however. You need to have the correct equity based on a host of factors
Well, i hope you or somebody else who plays well returns and elaborates a few of these factors, or presents a link to another post on the subject

I think that you are a little off in your thinking that most players will 4-bet their AA/KK back at you. I usually don't. I will usually let them think that they have the lead in the hand so that they bet the flop, which usually leads to AI quite easily.
Most players aren't as smart as you at 100NL (discounting most regulars). There are plently of weak players for buy in for full stacks and bet/raise whenever they get the opportunity with A-A/K-K preflop.

On another note, I think that you are losing a lot of value by playing your AK so aggressively. You are going to be folding out almost all other aces (except AA of course) and that is not a good thing. These are hands that you have dominated and that can potentially give you a lot of money.
I 4 bet A-K preflop usually as a way to take control of the betting on the flop. I usually don't just call preflop with A-K into a 3bet because most opponents will follow up on the flop with a continuation bet, and i will have to dump my hand to a non Ace or King high flop. Even then, the only hands that will continue to put money into that pot after the continuation bet would be mostly hands that i tie (A-K) or are dominated by (A-A/K-K) When i do 4bet, i do it lightly by essentially making a min re-reraise. So usually there would still be enough of my stack behind that even a solid flop bet would not leave me PC to the hand if my opponent called. But, your final advice...

It almost seems like you would be better off taking a different hand as your light 4-betting hand, since you arent really playing it for showdown value, but as a type of semibluff. You might want to use a hand like 66. It has a decent amount of equity against the range you have given (JJ/AQ+) and only needs 1 card to make it a much stronger hand.
Plus it is much more likely to get paid off if you hit. Not too many QQ hands are going to be happy about putting in more on a K or A high flop after the preflop action.
was excellent. I think it might be the biggest reason to dump A-K from my 4betting range against standard 100NL opponents, since as you mentioned my hand basically turns into a semibluff against any hands that would call my 4bet. And therefore using hands that have higher deception would make more sense Personally, i would pick SC's over smaller PP's for this due to their higher drawing power (more flops improve their hand, giving them lots of drawing options against an overpair) Although atm i use SC's only as a 3bet semibluff. If you come back to this post, could you explain why small PP's might work well/better for a 4bet than SC's?