I was using Naomi on my sites with the Backward Compatibility 6 plugin on. It was working well, but with no new templates or old one's updated, I tried Cassiopeia to look like Naomi. Never got that right.

Then Olivier came with the update Emani template. Tried that one as a base template for an updated Naomi template, it worked but with a lot of errors. So skip that one.
Then I tried Chatgpt using the latest Naomi version.

First version gave an error and gave Chatgpt feedback and after a few tries it came up with a Joomla 6 native (no b/c) Naomi template. Had a few J51 extensions updated as well, so now all my sites are running Joomla 6 native.

Do check other extensions/plugins. I had one the delevoper said in was for Joomla 6 but it wasn't, it crached the site, so I had Chatgpt updated that one as well and now it works without any errors.

Try it out for yourself on a testsite before going live.