There is several groups working on Czech localisation allready ...
The bigest one would most likely be this:
https://prekladyher.eu/preklady/baldurs-gate-3.590/They even take more people, if you wish to help ... it would probably be much more productive, if more people would join forces, rather than create bzillion separate projects.

But, its your decision ofc.
I think most Czechs want to play in Czech.
I dont ...
Most names of places, spells and people sounds horrible in our language ... not many people play with words carefull enough to make it sound interesting. xD
There are exceptions tho!
Like Lord of the Rings, wich had phenomenal translation. :3