Humbucker rings come in 2 length. One is PAF like, but modern ones could have enough length. You need more than 2.7 inch. Just check the dimensions on the parts suppliers. Be aware that cream comes not in a single hue, so you also can have a colour mismatch with our pickup.
The 35th Anni JB is a great pickup and reminds me of my MJ made JB. Just for shit and giggles I put an unoriented A5 into a modern JB and I was almost there.
The Antiquity JB I heard in the vids sounded a bit duller (less bass, less highs).
This dealer advertises an amp and extra modules. Maybe he sells them seperately
https://reverb.com/de/item/90202018-seymour-duncan-convertible-2000-w-five-additional-modules-serviced
I use a 490r in the neck, but i swapped the A2 to an A5 and an A4. Much better, with the A5 have a bit more bass and the A4 less bass and maybe a bit rounder highs.
Since Seymour standard is the pre 1958 strat he uses Clockwise North Up. Since this is a reverse-wired-reverse-poled pickup it's the equivalent to South up counterclockwise.
Another concept is an partial split which are used in some guitars like PRS. You need a resistor which leads from the series link connection to ground. In case of a Gibson pickup white and green in series with a resistor to ground, while red is hot and black is ground. The resistor can be...