I think that you missed my point. The proximity effect is (only) the bass boost and happens when you are very close to the microphone. This is a well known phenomena. I use the SM57 (when a dynamic mike fits the venue better - like if it looks like it is going to rain) attached to my music stand so there is a foot or more between me and the mike and little proximity effect if any at all. It is of little significance if I am 12", 15" or 20" away from that microphone, the sound is consistent and the sound engineer has no grief. I can move closer when muted and still need no help from the mix board. That is what I was talking about. I never play at a microphone from the side and don't know anyone else that does either. No one uses my microphone except me - not even at a wedding.
What I personally prefer is the AKG condenser clipon that I mentioned. I have never found any condenser mike that gave me freedom to move except the clipons. This to me is the best solution for sound, no feedback and ability to back off on long gigs. For players that like to dance around in the studio, I have even seen the recording engineers use 2 microphones to insure a fairly even pickup. I generally sit still except when using/changing mutes.