An old saw
I feel some sympathy with the customers, but I have published this here before: Q: What do you call Oracle customers? - A: Hostages.
It would seem an act of self preservation to only use (or construct) systems that do not use the Oracle stack anywhere, as they will suck you further into their alligator infested swamp. It may be better to use a "less capable" database and pay extra for the hardware to run it.