@RileyStarlight How about https://dirtypcbs.com/store/cables? Their selection of connectors is somewhat limited, so I'm not sure whether it'd work for your case. Also, make sure to read https://dirtypcbs.com/about first!
@joepie91 Thanks, I already knew dirtypcb. A few years ago we ordered a sample kit from them for this same project.
The problem with it is that they are very limited in the connectors/terminals to use, and in general with generic connectors instead of brand name. This is a problem for this project.
Anyway we were planning to ask them for a quote if we couldn't find another option.
@RileyStarlight (They primarily do PCB prototyping so that's what most of the About text is about, but AFAIK the same limitations apply for their cable manufacturing)