I'm afraid I can't help with the real question of the topic but I can address a few points raised.
WME Lite, itself, however is a much more manageable target and has better licensing for mobile development (there is still lots of vagueness as to what is allowed and required in terms of fulfilling source code requirements, as you cannot usefully provide source via app stores).
You don't have to provide sources through the same way (the app stores you mentioned) to comply with GPL (scummvm license). Any way is acceptable. Of course unless the app stores or the SDK prohibits the use of GPL (like nintendo SDKs).
Aside from that, I am interested in creating new content using WME; ScummVM is specifically not designed for that (they even mention it on their FAQ).
This is a very often asked feature for scummvm and this port will provide exactly that. Support for new content.
Scummvm wiki says so. Implementation in scummvm will recognize new & unknown wme games that follow certain criteria. Adding official support for them should be pretty easy (as long as there are no bugs in the implementation ofc).