Wow just setup this up and thank you so much. It works surprisingly well, just need to figure out a way to launch it from a shortcut in kodi. I assume we could launch a script that would kill Kodi and launch Steamlink. Would still need a reboot to get back in to kodi tho.
One note, the steps to mount the raspbian image file and extract the library files do not work on librelec, at least they didnt for me. Was quite a pain acutally, I had to fire up a VM, mount it there, extract the files, copy them over to my host and SSH up to my Pi. Anyway below is a link to a zip file with the library files if anyone else is having trouble.