I don’t believe the MIDI ports on the Maestro have the capability to do programming through them, which may rely on the functions noted in this post excerpt below. For a third party to develop an interface they would need the coding for the Maestro or reverse engineer what’s in it, which likely won’t happen.
I’m not a fan of iPhone or Android apps and prefer a PC with a mouse and keyboard, but I do have a cheap Android tablet for the things that aren’t available for a PC and I need to be able to use. If I needed something like the Maestro I’d likely look for an alternative device that was PC capable just to avoid Smart device apps.