Atm I'm just looking at possible options, but anything I do will be a couple of months down the track.
Basically if its gonna cost so much to supercharge the current engine, I'd do what you suggest and just do a complete engine conversion to either a GZE or 20V (I've been looking at both).
But it all depends on if I decide to get a new car, or decide the ae82's worth the effort and $$$ for a conversion.