Damn...

that is a dilemma.
(I'd leave it to the good ol' Yogi Berra wisdom: when you see a fork on the road, take it; pun soooo intended)

If you are going to ride it and keep it, I think that even the Pope would say that it is not a sin even if you put Simplex components on it and that suits your needs.

If you are going to sell it at some point, it would be a cardinal sin (with mucho consequences to your bank account) not to have those Campy components.

Judgment of Solomon: Do what you need to do, but keep those original components nice (and lubed, and in ziplocks) close, just in case you want to sell it some day.

-just my 2 sinful cents