@nonetrix@pleroma.site
Don't know what you're referring to exactly, but the one I use is basically infinitely customizable. I literally can reorder letters however I want.
You can even make something like this (picture attached). It's called Multiling O Keyboard, and while it definitely has a bit of a learning curve to setting it up, it could be worth it if you have a specific use in mind.
Be aware that it might not have the best prediction though.