or... Just do an OBB. The APK in those is usually less than 50MB and you just move the OBB folder and game data where it belongs, and offer the whole thing as a .zip
Honestly, Im not sure if this is possible to make an obb file for renpy game. Actualy, I didnt met any renpy game for adroid with obb for now and also I talked with one developer who told me that this is impossible to make renpy game this way with currently avalable programms. Probably it is possible to make it manualy, but I imagine that this will be a huge ammount of work.