I like the five roles you defined, and they would work well as part of a hybrid publishing collective of some kind... but I've tried to start such a thing with a friend of mine, and it didn't go well. Maybe we just didn't do it right! One reason it didn't gain momentum was our insistence that everyone be equal participants, we didn't take really firm leadership roles, we just created the structure and opportunity and promoted the benefits of it at a few writers' events, with absolutely zero interest. If I were to try again, I would recruit a couple more partners at the beginning, run it as a business not a collaboration, and market it as a publishing venture, something that people already understand.
But there are other ways of fostering collaboration. How about Eric Flint's Grantville Gazette? Flint created the 1632 storyworld and provides overall executive-editor control, but anyone can submit stories and participate in the online discussions. Several contributors have become published co-authors with Flint and then novelists in their own right, under Flint's patronage and in the 1632 milieu.
This is more of a mentor-led model than an "equal-peers" model, but having participated in a couple of peer-to-peer online collaborations, a leader or two (or three) emerge pretty quickly, and that person(s) does the lion's share of the work. Everyone else puts in their two cents and demands a 50% share in the end ("um, there are seven contributors here, you're not getting more than 1/7th, and let's talk about your participation..."). So maybe a patron/mentor model isn't so bad.
It's the sort of thing that LTUE and Flights of Foundry encourage in a cheerfully chaotic way, and Writers of the Future offers an organizational framework that actively fosters it. Participation is well paid, and thus highly competitive. (...yes, LRH started WotF back in the day, but he's been dead a long time, and it honestly does not seem like a recruiting tool for Scientology... if it is, it sucks pretty bad for that purpose)
Palisatrium's "Short Story" substack (https://shortstory.substack.com/about) is really just a stripped-down literary magazine, one story per month, but somehow it works... whoever's story wins publication that month (palisatrium is the editor, I don't know their real name, tbh) gets $100 plus 50% of whatever the subscriber revenue is that month, plus a good deal of publicity and another publishing credit for their byline. Is it really "collaborative"? No more than any anthology or lit mag, but it's run in a way that makes it feel either like a collab or a contest, depending on your perspective.
I would love to encourage more people to organize more "collaborative writing projects," especially those that could use the blockchain to objectively keep track of how much the various contributors contribute, which ones honor their commitments, how much is earned, how much is paid to whom, etc. That would make collaboration "trustless" in a sense. A friend of mine, Jonathan Jaech, would like to launch such a thing, and he's an IP attorney who understands blockchain stuff. But he's had trouble ginning up interest among authors, editors, illustrators, etc.
I guess it seems like any collaborative writing project is either going to be a few friends who already know and trust one another who agree to work together (and hopefully write up an agreement that will clarify the collaboration and protect the friendship!) or something that a strong leader or organization puts together, creating an environment in which collaboration can happen but which doesn't rely on collaboration as a management tool; something with guidelines and vetting and accountability of one kind or another.
Whether that looks like Writers of the Future, or Flights of Foundry, or a writers' society (or local college) that encourages collaborative workshops, or a solo-mentoring-effort-that-grows like Eric Flint's Grantville Gazette community, they are all opportunities to collaborate with other authors and hopefully reap some benefit from it yourself.
And create great stuff for our readers!