What about iC Pro for Samsungs with Professional Audio h/w?

While not the whole Android market, Samsung devices (N3, N4, NE, S5, S6, S6E and others) with Professional Audio hardware are still tens of millions of possible customers.

The PA hardware is low latency and is what IK Multimedia specifically targets for their Android stuff, like AmpliTube.

With devices like these, SB might be able to even send foldback audio.