That's it, the deed has been done.
Two B90s custom-wound by Mick Brierley in Adelaide, South Australia, have now replaced the HRW humbuckers on my H535.
Not only do they look like they belong, but first impressions after a couple of hours experimenting with tone, volume, pickup combos and two different amps are very positive. Brighter tones, better definition and depth, more character than I was getting with the humbuckers - not just to my ear but to my bass player friend as well. Sounding closer to, yet different from my Lollar P90 mounted H530. Early days but very excited with the new lease of life this has given my H535 and the many possibilities waiting to be explored.