Dear LFPF friends,

I need your advice.
I am looking into acquiring a 90mm lens for Sinar P2 to do interior architecture photography.
My aim is to have highest possible overall and detail quality with room to shift with a lens that is bright enough to see an image in the ground glass before stopping down.

I really want to work with Super Angulon XL 90mm f/5.6, but it needs a center filter, which, I have learnt, is extremely rare nowadays.
I have read some people recommend to overexpose and edit the negative later on. I also found a center filter for 72mm Super Angulon XL is the same thread size, which is a bit denser and I might end up with having a neg with bright edges.

I feel like it is not worthwhile investing in such a lens if it won't bring best results without the CF, or am I wrong?

Yet I feel these lenses might be still excellent, though with smaller IC:
Sinar 90mm f4.5
Rodenstock 90mm f4.5 Grandagon
Schneider 90mm f5.6 Super-Angulon Multicoating

but how do I calculate what center filters they need? Can I purchase contemporary CFs with the right density and thread size? I am very confused.

Any advice would be so much appreciated.