I hear you but similar efforts are involved in SR20 1600's etc...
I love Toyota's engines too but they're not the only good motors around. Sometimes I think purism can stretch a little far is all.
If I were given the choice, I'd probably just turbo my 20v over the SR20. Because I've already got all the running gear I need..And to be honest, I wouldn't need an SR20. Too much engine for me.