Well, I can confirm that the 323 BG Wiper Transmission will replace the Capri one with a little bit of work
I went out and tested the cheapest combination of parts that I could. I had a BG wiper transmission, a refurbished Capri wiper motor, and NOS Capri arms to work with after everything on my Capri failed
The transmissions are almost identical looking, which is a good sign, but "modifications" are necessary on the car and on the transmission
I forgot to take a picture before I cut them, but there are 2 legs on the BG mount that need to be cut off so that it will turn properly. Also, the locating detent on the car will need to be extended because the BG's pin is ~3mm further out than the Capri's
https://i.imgur.com/ccMLSXS.gifvIt works like a charm now