I think you're going the right route by boosting the K instead of the H. The H might have gotten you 250ish whp before you'd have to sleeve and build it. The K will get you more than that although I don't know about 500+ whp reliably.
Yes that is the reason why I went K because I really did not want to rebuild the H. As far as the k's go many people have been making crazy power with K20 more so and K24's also making in the 400-600whp with no issues with minor upgrades like Head studs, fuel, kpro etc. I'm not building a drag car so I should be fine. The tuner I'm using has one of the highest recorded turbo K24's and k20's in the world on stock block and had built and tuned many high power K's, some where in the 600-800whp range some had more done then others of course. I'm actually not using a bone stock motor and do have some aftermarket internals but no way looking to break any HP records 400 will be great lol
damn I can't believe my **** hasn't blown up after almost 9 years of boost! even with 5-6 months of untuned AFC hack
OG boosted accord is still around nice.