fly multiple planes together with a single TX?

I have an interesting challenge for this group. I'm looking for a way to be able to fly multiple planes over DSM2 from a single TX. This is part of a project to facilitate youth groups to be able to build and fly planes together at low cost.

The way I imagine this working is depicted in the image below. Assume that cell phones would act as controllers that would talk to a magic box that can interface with a TX running Deviation and send it input commands. I'm pretty sure this is possible... But I don't understand the DSM2 protocol or deviation source well enough to know how to independently control multiple planes from a single TX module. Someone on the rcgourps forms had some success using a spectrum dsm module, but support was limited by the modules implementation.

Since Deviation runs its own DSM2 protocol, how would you do it?
What would be the limitations / challenges of such and approach?



Your input is greatly appreciated!
-Corom

FDR wrote: You can control them through the PPM in function, but AFAIK that is limited to 8 input channels...

Fixing that is a SMOP, and one that's been talked about before. The trainer port is on serial pins, so you can use a real serial protocol like S.BUS on it, getting you 16 or more channels. This looks like it might be the easiest part of the project, but I don't think anyone has expressed any interest in implementing it yet. Of course, providing me with interest in such is why I set up a patreon account .