This is relevant to my interests.....
*listens intently*
I've asked a very similar question not too long ago and the general response was: Yes, it can be done, but it's more trouble than its worth. I guess if you're set on the 2dr VR6 then you don't really have many options other than importing or building one yourself (although there is one for sale on the site). I'm not sure of the potential of the 1.8l donk but if you did some work to it, I'm sure you could get a decent output.
As for RTA, I think it should be relatively easy as the engine was available in the car and from past experience I've heard that it means you don't need to get a mod-plate (or something along those lines). However, this was old Mazda/rotary conversions we're talking about, so it may not apply.
Take everything I've said with a grain of salt because I'm still new at this, but hopefully I've helped a little bit.
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