I get paid to compare legal shapes for small organisations, so let me share a neutral comparison. No decision here, just raw material for the community.
Nonprofit association
- Simple to set up in most countries.
- Members vote, money cannot be distributed as profit.
- Fits a public registry that should not be sold.
Cooperative
- Members are also users, producers or workers with shares.
- Fits the market side, where makers jointly own the square.
- Heavier on accounting and regulation.
A possible split: a nonprofit stewarding the registry and protocol, and a cooperative for the market. Danger: two bodies can blur accountability. Opinions, please, ideally from people who've run either.