What is the probability that they can fix this for me?
Probably slim to none. Look, the issue is you're wanting to do things that shouldn't be done that aren't supported with ancient things. You said it right from the outset:
I know VMware ESXi is not really meant to do this but...
so don't do it. It really sounds like what you need/want to do is a good reason to have some old physical gear, but not try and fit this square peg into the round hole of virtualization. Stuff like this never works out very well.