Re-read your post,

Yes all Williams 90's games have coin/credit settings in the software.

CPS2 only has basic coin/credit settings, 1 coin 1 credit type adjustments. To make CPS2 and the KI2 cabinet coinage work together correctly you would need to add a credit board board, a Klingon, Solo Dispense, Excel. (Suzo/Happ sell these).
The credit board takes all the outputs (£2, £1, 50p, 20p, 10p) from a coin mech, totals up the amounts and provides a single pulse to the gameboard for credit depending on the price of play set on the credit board.