Hi, I'm not the author, but I think I can provide a little bit of insight:
It's probably difficult to do this kind of script, and there would almost certainly be errors you would have to fix personally.
Part of the issue is due to the differing requirements of the set up: Namely the Combinators that you use for LTN can be set up anywhere up to nine tiles away from the station, I believe. And as you mentioned, the combinator can also be used to go to multiple depot stations.
Whereas the rail dispatcher here has to have one dispatcher for each stop, no matter what kind of station it is. Additionally, it can only be 1 tile away from the train stop, which can be an issue depending on how much space is available around each stop. So these two things are the quickest conflict i can think of.
With that said, I think it should be possible as long as you make sure there is a combinator for each stop, and that they exactly 1 tile away (directly adjacent).
While that sounds like a lot of work, it also seems like you have a large base if you have that many stops. And I would be interested in comparing the performance between the two mods at the high end. I know that one of the earliest questions was about that topic. If you're willing, I can try to do the replacement by hand if you give me a save / want to do it on multiplayer.
