ST produce these things specifically to support development on their own chips - they are not intended as "general use" tools.
There are plenty of 3rd-party options for that ...
PS:
I'd have thought the Source Measurement Unit (SMU) part would work OK with non-ST loads - just not the debug/programming part?
A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
