For those, it’s normally two or three people at most — not a big deal to just list them all (often one as “additional”).
I think Various Artists is a workaround for things not being able to handle too many artists in a database field — that doesn’t seem to really apply here. Having 10 different relationships on a work isn’t a problem.
But maybe no artist makes sense. Arguably, there really isn’t any composition/authorship/creativity/etc. involved in the main work that isn’t in the sub-works. So then there really is no composer; there is merely a publisher (and maybe an editor).
Arguing against that is that relationships don’t really propagate along the hierarchy as expected. If you linked a recording to the main work, it’d show up as having no composers. That is not good.
So I guess in an ideal world, I’d suggest no composer, and that the composers of the linked parts would propagate up automatically and show up as 10 different composers of parts of the work. (Also, ideally, a composer could propagate down…) But with the software we have, I think it’d be best to link them all, as annoying as that is to enter.