Real question, where are you going to buy the swap agreements?
I am in the "false confidence" stage of Dunning Kruger Syndrome for finance stuff, so I personally would do swap agreements, but I'm not an average case.
Still, as you said, just mimicking regular QQQ is achievable.
You also don’t need AI to do this. Before AI, the main barrier to direct indexing was the amount of capital you need. That is still true.