If you want any of this, why don't you found a Verein and have open source activities as the purpose?
All in all I an very much against this. Mostly because I think Ehrenämter, as they exist now, are pretty stupid and pointless and because I strongly believe the state should not get involved with this at all.
If you want to have legal protections and a proper governance structure you would found a Verein. Codeberg has a Verein with Gemeinnützigkeit, which seems a superior, already established, way to accomplish this.