Great, thanks!
In addition to KoboStuff, I've gotten a bunch of other things successfully installed, after much hassle (NickelMenu, KFMon, rmkit, remarkable puzzles), and there's only 2 things left I want to get working for now.
The first is Vlavsoft pbchess. I've downloaded the latest release for Kobo, and copied the files into /mnt/onboard/ accordingly. Whenever I launch it, however, it kills the Nickel process, and then fails to start. I can still navigate the filesystem over ssh, so things are still working internally, but I have to restart the device by holding the power button to use it again
(unless you know how to restart Nickel). Running Vlavsoft's `launcher.sh` in the ssh terminal shows the error `mount: can't find /mnt/sd in /proc/mounts`
The 2nd is USBNet. I have the KFMon config set that runs the internal toggle command, yet it doesn't seem to do anything, and even when I call the toggle command over ssh, I can't get the device to be accessible over USB.