I set it up a long time ago just to play with it a little. I wrote a tutorial for how to get it to work in Docker.
I don’t think you can use two different versions of Jython at the same time.
I’m also not sure if pip installed libraries are available or not. Those libraries don’t exist in the Docker container so I never explored that avenue. I also never really got much further than exploring what was possible in it. I never converted my Rules over.
Performance is generally superior to Rules DSL and I’ve not seen any complaints about reliability. There are far fewer people available for support on this forum though, if that is a concern. You should look at Lucid, which is a Jython library that makes writing Rules a bit easier and cleaner. Search the forum and you will find some postings.