I am not sure, if I clearly understand that. I am assuming you're looking at CUCM-BE integration with UCCX. If so, CUCM-BE and UCCX integration is still supported.
Starting with UCCX 10.x option of running CAD or moving to Finesse is supported as well.
It was instead of the existing cme. If they can not do cme with a new UCCX then possibly suggest to migrate, upgrade to be and UCCX
Does cucm-be come with UCCX ad a bundle?