I'm not sure I ever suggested this package, but you may want to try xkeycaps. It's a GUI for xmodmap, so that should help. Development stopped in 2000, but it's a very mature product, and it works as designed.
Thanks for the link to that page. Needs studying, and I will save it for the future.
44 posted on 08/22/2024 6:01:06 PM PDT by daniel1212
(Turn 2 the Lord Jesus who saves damned+destitute sinners on His acct, believe, b baptized+follow HIM)