Finally a worthwhile update after being away with work and mainly searching for parts.
I had to go for it and gambled on quite a pricey pair of Arrows A21 rear uprights and driveshafts. There are so many variables within this area it was a bit of a risk but getting stuck in today it looks like they will work
Wins
The tripod driveshafts fit my gearbox ☑
Tierod attachment seems perfectly located ☑
Brake calipers fit the rear rims with no modification ☑
Issues
Only one wheel nut (If anyone has a blue L/H tread A20 or A21 wheel nut then please let me know!)
Hub locating lugs do require modification. The Arrows features 6 (3 bullet shaped and 3 smaller cylinder shaped) lugs. My Minardi rear brake bells only have holes for 3 lugs. This meant I had to modify the Arrows hub by removing the 3 cylinder lugs. The first photo is post removal. I had hoped they would unscrew but I had to grind them off. The spacing of the remaining lugs is also slightly less then the Minardi rims and bells. My solution is to enlarge the bell holes and 3 holes in the rim.

I still need to do the brake bells but the titanium will require better drill bits or some outside assistance.