One other question about the "Pre-E" versions with the Swartz safety - can they take any other 1911 grip safety, or is the grip safety different as part of the safety mechanism?

If they can take other 1911 grip safeties, would switching to a traditional flat grip safety (without the big bump) be likely to make the fp safety less likely to disengage, making the firearm less reliable?

I'm used to the traditional Gov't model grip safety, and while I'm not unwilling to try out the popular bumpy kind, It's comforting to know it could be switched out.