Have you had a look at Super-Patcher, was a bit hit when it came out, there was some grumblings that a lot of what was in it was stolen from the O.G, but the guy who did it (Brett8883), made it really easy for the less I.T literate, and was a great hit on many forums.
Also, and I know you said Github was a no go, but sometimes you just have to:
brett8883/DJI_Super-Patcher: Liberate DJI drones. Height limit, NFZ limit, enable Galileo Satellites + more (github.com)