I think the trick is sympathetic improvement where it looks original but runs better, imho originality can be taken too far
Agreed. Originality is only relevant (IMO) if you want a concourse car - and I've never seen a concourse Beta (a couple that come close but .....)
If it improves the car (mechanically) then go for it. Visuals are rather more subjective but I have no issue with non-original wheels etc.