If you mean the Final Fantasy Project Overhaul that CarbunkleFlux is making, I'm not sure, the checks look for the class ID and not the specific names, so it'd probably work, but be kind of odd, and definitely not balanced for FFP. The Sage job is currently being worked on, and I accidentally left it available while testing. Use it at your peril, I guess.

Does it work with Final Fantasy V mod?
There's also a bug: Sage Job is available without requirements