Unfortunately, I only transferred the mod to a new version, because the original author no longer released updates. I don't have enough skills to expand the functionality.
But still I have an understanding of the logic of some things. And I think it's possible to make one universal assembler that could produce several materials at once. I even saw a mod that implemented something similar. (A factory that produced materials internally and used them as intermediates for other things). But you have to remember that this can seriously disrupt the game balance.
If you wanted to save performance or space on the base, you should try such mods as: Factorissimo 2,
If you still lack bandwidth, you can try mods like: Ultimate Belts. Or you can try one of the big mods that already have built-in belts. For example Krastorio 2 or mods from the Angel's series and Bob's.
Sorry it's so late, I very rarely read updates. Usually only when I start to play actively myself.
If you are interested in any other functionality, feel free to ask, I have also played more than 1000k with mods, and maybe I can suggest something if you are interested.
But if you want to get an answer not in a year, then I think it makes sense to write to me in discord: ElizTriad#0652