Been busy at work, but managed to pull a new version of the T2 amp board together.
I've added separate modules for the active batteries, balance servo, pre-CCS feeding the output CCS and the opto coupled output servo. I should be able to plug and play with a few options on these modules.
Here's a rendering (Eagle / Fusion 360)...
I still have to test, but so far I'm happy with the layout.