@Pigs you did an awesome job with your BB!!!
Just a thought, and perhaps an idea for you to consider...
My Tek Division SBS has a DNA60, they designed it with no USB connection on the body, for aesthetic reasons no doubt. They included a sealed USB board for connecting to Escribe. They soldered-in a 5 pin male connector on the USB board.
View attachment 1003529
To me, it looks like TD sealed the USB board in some clear silicone (not sure???). Maybe some kind of shrink wrap??? They did a very tidy job of sealing the board.
View attachment 1003530
TD soldered-in a small 5 pin connector on the DNA60 board (as seen above).
View attachment 1003531
When I needed to connect to Escribe, which is rare once I've set it up, I simply connect the USB board and it's set.
Perhaps you can fashion something like that for your BB? Just a thought Mate.
ETA: Looking around, I see there are several different kinds of clear shrink wraps (tubing) that would also work to seal the USB board. Whatever TD used has a thickness of 1mm.