Here is an OSMC add-on that will launch RetroPie in my Dual-Boot RetroPie / OSMC build:
Here are 2 add-ons – RetroPie and Raspbian – for use in my OpenELEC Triple-Boot build:
Here is a KODI add-on I have made that you can use in OpenELEC that – when using my OpenELEC / RetroPie Dual-Boot builds – will exit KODI and launch RetroPie:
Here is a guide that shows how to add a custom shortcut in KODI (i.e. to run a pre-made BASH script, such as my partition switching script).