Eventhohugh I also have some comments to the structure of TMC5 - it is but the question of time to become accustomed - is there a chance to have new TMC5 also preinstalled in CMSimple_XH? Probably not, though...

CMSimple.skIt's no shame to ask for an answer if all efforts failed.
But it's awful to ask without any effort to find the answer yourself.

Eventhohugh I also have some comments to the structure of TMC5 - it is but the question of time to become accustomed - is there a chance to have new TMC5 also preinstalled in CMSimple_XH? Probably not, though...

It's a bit early for having TinyMCE 5 in a stable CMSimple_XH, IMHO, but you can get the latest version of the TinyMCE 5 for CMSimple_XH plugin from https://github.com/manu37/tinymce5.