It always bothers me when I can't find something... So I kept looking a bit.

It looks like the JB has an inductance value of about 8 H.

https://guitarnuts2.proboards.com/th...nalysis-review

That would be about double what you'd expect in a PAF with an alnico 2 or 3 magnet, and also about double what the guitarnuts guys found with the SD Jazz and '50... So you'd expect the JB to be a LOT hotter than a vintage style PAF style pickup.

Returning to Australian winders, the Martin A Smith "Modern Humbucker" looks like it should be able to keep up with your JB in the bridge. His "Vintage Humbucker" has specs similar to what SD pairs the JB with.

Since Martin A Smith appears to be a small shop, it might be worth contacting him, having a conversation with him, and seeing what he recommends.

I have had pretty good luck talking with pickup makers. I have purchased a couple of sets of pickups from Epic Custom Shop in Michigan. After talking with the winder about a set I wanted for a Tele, he asked me to send him examples of how I wanted it to sound. He's winding them based on that. He even matched the holes to my bridge plate. Hope you have luck as good with an Australian winder...and that you'll post the results ;-)