This was precisely the situation I was in! Luckily, the Eclipse JDT.LS contributors are super helpful, and provided me with a lot of their time answering all my questions, which I have now tried to document in as much detail as possible in the Eclipse part of multilspy. My sincere hope is that multilspy can serve as the repository for all other language servers.
I hope you revive "that idea" and I would be glad to help in any way possible w.r.t. multilspy to help you through!
I hope you revive "that idea" and I would be glad to help in any way possible w.r.t. multilspy to help you through!