We're mixing two issues here: (1) not preceding certain effects (like germanium chip fuzz boxes) with a buffered signal; (2) having your effects follow, rather than precede, your guitar's volume control so you can vary the input signal level to them from your guitar.
For a guitar with a UGB and OBEL, both are resolvable. The simplest solution I can think of is to let go of your analog pedalboard and embrace the dark side of digital modeling effects. In my case, I dropped my painstakingl- assembled analog pedalboard for a LIne 6 M13, which is basically 100 or so effects in one box. I insert it into my guitar's OBEL. Nothing in my UGB makes any difference whatsoever to the tone of any of my effects now, fuzzes included (not that I use any with my Dead rig anyway).
If I wanted post-guitar-volume-control fuzz and other similar effects, myself, what I'd do is add a Line 6 M9 or the like between the output jack from my guitar and my amp. The Line 6 units are loaded with models of many different types of fuzzes (+ tons of other effects). Again, none of them give a darn whether the signal they see are pre-buffered by your guitar or not.
A brief concluding response to the readily-anticipateable-on-this-forum comment, "But that's not what Jerry did." Well, among other things, the digital multi-effect units we have today did not exist in his day, plus he wouldn't have faced the post-volume-control fuzz issue because he didn't use one (that I'm aware of). Devices like the M13 and M9 - they're just boxes of rain ...
MY ORIGINAL MUSIC (available on all streaming platforms):
Galvanic Samurai (2021)
Traffic in the Moonlight (2023)
So Glad I Came (2023)
Desiderata (2024)
Duality (2025)
Love, Loss, Ecology, and War (2026)
Caught in the Current (2026)
Legacy (coming 2027)
Jerry would be the first to tell us, "I never spent my life copying anyone."