Trying to answer in the best possible way:
0) TAGHeuer has a nicce bracelet available for the re-edition Monacos. Contact your AD. Be aware, however, that it appears that the steel bracelet will only fit properly in cases with serial numbers CW21XX-0, as cases without "-0" have the pin holes positioned differently.
1) Vintage bracelets do fit in the current re-edition Monacos. I know from experience that a NSA bracelet perfectly fits in my Monaco which, by the way, has not a "-0" case (see above).
2) Vintage style bracelets and straps are offered from time to time in the Sales Corner. You may want to check there.