I don't see why one couldn't be fitted to the Girvin forks, they just use a bolt through top & bottom, so a case of finding a shock of the right length & stroke length I would think?
The rear sus on Proflex use a different mount though, so you would need an adapter making for that.
But for the front I say go for it! as the Risse shocks (and even replacement Noleen shocks) are pretty expensive for what they are imo.