I don't get what you mean by easy. MERF installation is annoying because of all the signal wires. Its simple enough for me.
http://airsoftcanada.com/showthread.php?t=169957
22 TPA is ZCI HT, Chaoli Blue (comes in some Chinese guns like JG, CYMA, A&K etc.)
You would have better trigger response with a ~16TPA motor like SHS HT, but then you may run into feeding issues without a delayer. With a delayer you will likely run into FPS consistency issues due to tappet pre engagement.