Get a Cordoba subframe and get it stitch-welded, which will make it a lot stiffer.
The mount at the back of this subframe is different to the Golf2 ones, but should be better for it. You can cut off the rear tabs,unless you want to bolt them up through the floor to add extra rigidity again.
I would avoid using a solid front mount, especially in view of you using the car as a daily. Golf2 1.3 rear gearbox mount should be sufficient - it's solid rubber.