i consider wilson combat high end and i am using a WC lightweight bulletproof hammer/WC bulletproof ambi thumb safety and it doesn't perform that action.
am i wrong for considering WC and those parts as being high end? those specific parts sure as hell carry the price tag!
Wilson parts are, exactly as you're perceiving, definitely top tier. You are right ... Not wrong. The machining from barstock is the main reason for the higher price tag. Most other manufacturer's small parts are fabricated with less expensive techniques.
When combining different manufacturer's parts, of course, the compatibility of fit becomes critical. If two parts don't match up with each other, there is a problem, regardless of quality. I understand that this might not be pertinent to your specific components here (hammer and safety), but it is an important consideration in the bigger picture of a custom build project.
From my time on the Wilson sub-section of the Forum, its my understanding that Wilson parts are generally designed to match well with JMBs original dimensional specs ... and function in the same way. Not all 1911 manufacturers take that perspective, which has consequences that may be positive or negative in a given situation. Wilson parts tend to be sized for custom fitting (with sufficient material present), rather than drop-in fitting (of a fractionally undersized part), so be sure that nothing is improperly binding.
If you have a remaining question about Wilson parts (or if I've not answered your question), I'd like to invite you to visit the Wilson subsection of the Forum.