The tool to be use is MKXP:
Can be used with RPGMaker XP and VX / VXace.
This should be straighforward to make it running on the GameShell. Only issue, the game need to be playable using only a standard gamepad (with no R+L button)
MKXP is the tool that has been used to port “To the Moon” to Mac OS X and x86 Linux (and other ARM linux platforms)
(edit: and of course the one pointed by @aewens is in case you use one of the older version of RPG Maker, there is no known version yet for RPG Maker MV, but at the same time the export function of it seems to not be only for Windows, not sure for ARM Linux though.)