Hi Plink. Ever get the Vz24 running? I just sold mine...and miss it.
The Saiga could be adapted with some discretionary dremeling....but at the end of the day, you'll have done a lot of work (and risked the potential of messing up your receiver permanently) for what? ...nothing you can't accomplish with a PSL butt stock. Cheaper too.
I have an old PSL butt-stock lying around somewhere if you want it; got it for my 410 Saiga, but the raised cheek-piece area just is not conducive to left handed shooting...which i do almost exclusively.
Cheers, Dd