I approached this weaker magnet idea another way. Another effect of weaker magnets is slightly improved sustain due to less 'pull'. I installed a SD SBP-2 in my new bitsa. This has standard magnets, but is overwound. By setting it a bit lower, the magnetic interference is reduced a bit, with the hotter wind bringing the signal back up a bit.
That's my theory, and I'm sticking to it.
Good excuse to buy a new pickup, anyway!