In short: while my own motivations for this action are principled, the truth is that it's really the only pragmatic choice. User-agent based discrimination is not tolerable. Best push back now.

I 100% agree. Of course, because of my platform, I don't really have the choice anyway... but AFAIC messing my UA string is only going to happen if I can make it say something like you've advocated above, though right now it says I'm running Moz.