Short-term, CSO's working on a social networking site for "MMC community professionals" - web developers, merchants, service providers, miners, etc. That should give us a place to market ideas like this, see if there's anything related, or if anyone else is interested in advertising further, etc.
Long-term, I like MMC as an "open-source collaborative planning" platform...start with a bunch of "what-ifs?", then see what develops. We can always play in MMC and see where it goes. For all we know, someone's already working on something similar, and maybe they just need a bit of co-branding.
But credit union is only the financial aspect of possible "cooperative" models. Could use it for personal accounting, private business management, or even incorporate your "for profit" and "for the benefit of MMC" selves separately. Could extend the model to other currencies.
I think the "for those MMC shareholder who agree I am acting in their mutual benefit by voting for me" concept could link and span anything from consumer, professional, sole proprietor, LLC, corporation, non-profit, etc. Would provide a solid-basis for "trades in MMC should be tax-exempt, trades in fiat should be recorded and accounted for".