That's a hell of a lot more work than "install DOSBox".
How would you do that? Is this a thing now?
Yup, Home-Brew ISA Cards is a thing. There are people out there who have reverse engineered some to create clones, not only for ISA but for more modern buses too.
Does it have to be working to be reverse engineered?
Typically folks will go looking for these services after the device has failed :(