I put my PEI plate in the dishwasher and then used glue stick and it fixed my problem but YMMV

Re: cinnamon: This guy has some videos on how to set up multiple keyboards and set a shortcut to change between them.

Can’t speak to hamonikr.

Adding new keyboard languages https://youtu.be/jbKVfZ6M0c8?t=46s

Setting keyboard language change shortcut https://youtu.be/omdUhZ489PE?t=27s

Best of luck and remember that there’s always a learning curve with these things