I've tried an A8 and really like it. I don't think it is overly bright but if that is a concern then you might want to try the A6 as suggested previously. A ceramic mag would be a BIG mistake imo.
You might even consider a different pup altogether. A Screamin Demon (unlike its unfortunate name suggests) is a really tonally balanced bucker (no shrill high end) with a slightly stronger output than the BB, but still with a PAF-ish tone and feel. I've even tried it with an A8 and love it in the bridge, and an A2 and love that in the neck.
Good suggestion. The Demon is a misunderstood gem IMO. As you said, I think that's mostly due to the name.
I agree: PAF-ish tone profile with a little extra push. Most importantly for the OP, it stays pretty punchy with gain.
However, I wouldn't expect it to match the ToneZone or Custom 8 in terms of output.
Likely still to require tweaking the rig when switching guitars.
Since IMO a mag swap isn't the right answer for the OP in terms of output, a couple other possibilities:
Rebel Yell from BareKnuckle. Bright like a PAF yet this one handles gain like a champ. Cops vintagey tones and can also chunk.
Right on the line between vintage and modern tone & feel. Keeps its attack when driven. Excellent string-to-string definition too.
Articulate and quite responsive - sparkles when rolled back & treated gently, but open it up & hit harder and it gets fierce.
Somewhat hotter than the Demon, not as huge as a TZ. More of a sword than a club, but should do great in a Les Paul.
Holy Diver is another BKP option. Sorry to be taking us farther into VH territory

but it's a great pickup.
Not entirely unlike a JB: it cuts well and sings similarly, just with better balance. A bit less of that nasal presence.
Also offers better cleanup. And while there's a nice springiness to its feel, the lows don't go all spongy under gain.
This one could hold its own next to the OP's other bridge humbuckers in terms of output.
Finally, an idea out of left field - Railhammers. Definitely not a traditional look where cosmetics matter.
Still, their unique design is meant to keep the low strings tight while the higher ones stay more open. And it works.
The Chisel bridge is big, bright, tight and in-your-face. The Alnico Grande is rich, fat, and bouncier but not flabby.
I have both of these and like them. Worth considering IMO - as long as unconventional looks aren't a deal breaker.