Duncan Quarter Pound Stack?

[Mincer]

And while we are at it, I'd like a noiseless version of every single coil!

[ArtieToo]

While not a stack per se, I do have a vague memory of doing a neck & middle QP, in an HSS Strat, many moons ago. The middle was RWRP. They were connected with a DPDT switch to be series or parallel, with either being hum-cancelling. Two good sounds and easy to do. I think the only reason I didn't keep it is was at a period when I was swapping Duncan's pretty often just to try them.

[uOpt]

Does anybody make half height QP style rod magnets?

That could be one obstacle.