Curiosity got the better of me and I had a peek inside my oplab module.
It doesn’t open up easily (glue). Wouldn’t recommend having a go but it went back together fine and all works again 100%.
Some really nice engineering to get it so thin (the flex-pcb connectors, the light pipes for the leds and the tiny switches), it really is tiny.
@Punji helped out ID’ing the main components: 4xOpamp (TI Y62264A) for CV and gate; an interesting choice of a fairly beefy micro-controller (Cypress CY8C5888) - will be good to see what they do with that in the future.
Looks like limited (zero!) prospect of a open/hackable module unless TE opens things up a bit with a dedicated diy module - but we can dream…