Delta VFD-M - Drivers?

I have a Delta VFD-M and from my research, while similar to the Delta VFD-B, several of the RS485 modbus registers are different. Before I go about modifying the source and recompiling, I know at least one or two users have already done this work previously. Does anyone have a working build or example source code I can work off of? It'd be really nice to have spindle control both for g-code as well as the axis UI.