Cool, thanks again @Ronin1973
Just to clarify, in answer to my question regarding an output module; were you indirectly answering that when you mentioned having a mixer? Would the Intellijel Quad VCA serve as a mixer?

I forgot to mention that as well as the 0-coast and Keystep, I have the Morphagene already. So I have a Happy Ending rack (84HP), and my plan now is to get another 2 to 4 modules that I can fully dive into, and will enhance the 0-coast possibilities.

So, in your opinion, if I were to get the Zadar, a Maths and the Disting Mk4, would this be a workable, basic set-up? Or would I need a mixer and/or output module? And I might also get a micro Plaits to add another voice too.

Also, regarding headphones, yes I will be very cautious - I'm currently coming out of 0-coast, into pedals, out of pedals into an Alesis mixer, out of mixer into studio monitors....no headphones involved. was just thinking about the Rosie for live performance in the future.

To give an idea of what I want to create, I'm really into cosmic collage, stuff like Cool Maritime, Koen Holtkamp, Kaitlyn Aurelia Smith (not the stuff with voice particularly, but her collab with Suzanne Ciani blows my mind), ...also stuff like DSR Lines, Matthewdavid's Mindflight, Kosmische shit...Klaus Schulze, Didier Bocquet, Laurie Spiegel, etc etc

Check the track called "Forest Bathing" here to get a good idea of what I want to do:
https://coolmaritime.bandcamp.com/album/sharing-waves

Thanks again!