Regarding the problems arising from sharing pitot, static, and TE across mechanical and transducer-based instruments:

I can see why the flow generated by anything using a capacity would be large enough to cause trouble. My gut feeling is that flow into or out of an altimeter or a mechanical ASI would be too small to matter.

If these instruments are impactful, what’s a workaround for a situation where finding truly separate pitot and static sources for the mechanical instruments is impractical? I’ve seen experimental gliders with digital altimeters, but I suspect a TSO’d option would be hard to come by, and I don’t think I’ve ever seen a (modern) sailplane without a mechanical ASI.

Would T’ing off static and pitot lines somewhat further than the traditional 6 inches from the instruments do enough to mitigate the effects?

Genuinely curious about this.

Neiman