Today I took the plunge on a new sdcard to try out OSMC. Im clearly not a fan of the OSMC skin thus first thing I did was change the skin to confluence. I had plenty of add-ons and settings i didn’t feel like setting up all over again so this is my approach i took and so far so good.
I basically copied my userdata folder and my addon folder and rebooted i did this while kodi was shutdown of course. Another thing i did was delete my thumbnail folder and deleted my textures db file as the thumbnail folder was massive.
Best of luck !