I have seen an R33-fronted Stagea done once, but I think it was a custom job for some workshop in Japan
If you want an "easy" solution, MASA motorsports in Japan make a kit for the R34 front end, and this is one you've most likely seen around. It's far from cheap though, especially with the way our $Au is compared to the Japanese Yen.
There might be someone doing a copy of the kit around Australia, but I'm not sure. There was talk of it happening, but whether they actually went through with it I don't know. Probably the person to ask would be Darrin, I think he actually has his R34-fronted Stagea for sale at the moment. His username is "darrinspencer" and I'm sure he'll pop along and contribute to answering your question soon enough.