This is sounding cool. It is nice to have an install path that doesn’t require WiFi. Another option might be the shell object that is part of Pd-extended (you can download it compiled for Organelle here). I was experimenting with it once to make an ‘installer’ patch that would install some extra OS stuff. So in this case you could have an ‘Install Monome’ patch that would have all the resources and a shell script for putting them in the correct places.
Also a side note, do you know about this https://etcher.io/ for burning SD card images? It is cool because people can use it to write SD card images who might not be comfortable doing so on the command line.