People have done H22A swaps into Gen6 Accords before, but yes, the swap is not just a "bolt-on" replacement like it was for the Gen5's. The wiring is NOT easy, and yes, the engine mounts don't line up correctly, IIRC.
As for the new Gen7 AV6 with the "J30B" engine, it is the exhaust manifold that is integrated into the head, not the intake manifold.
Also, the RSX-S engine swap into a Civic has been done. There are pics floating around somewhere. Oh, you were saying not "easily" though. hehe...I think it did take awhile to get it working.
Honda seems to be trying to shake its "riceboy" image by making their cars much more difficult to modify. Integrated cats, integrated exhaust manifolds, little to NO room in the engine bays, etc. I really don't blame them, either.
Anyways, if you just want something unique that nobody else has, keep in mind that ANYTHING can be done. The only limit is money. If you just want something that's faster and you don't care about uniqueness, it might just be more cost-effective to trade in your car for something else.
Last year when I still had my AV6, I realized that the only way to get the performance I wanted out of it would require spending WAY more money than I expected, so I was going to trade it on a WRX. Some idiot did me the favor of totalling it though and when it came down to a decision I ended up getting a 5spd Maxima instead.