Yes, that could work. The LaTeX part should be pretty easy, I can figure that out myself.
Re merging the tables: I really don’t know how that would work. I could of course convert the verb table into long format (i.e. each verb form in its own row), but I don’t see how that would make things easier. I still think the best option is to keep them separate and then maybe have the python script combine them.
Re python: Yes, sure that should work. If we can get to the point were the entries are all sorted together and we can export that to csv that’s really all I need. Unfortunately, I’m predominantly an R “speaker” and not very good with python 
BUT if someone knew how to implement that sorting script in R, I think I could do it all in R.