I think this is what Esperanto did in the beginning but I can't find a reference for that at the moment. Ironically, I found this, http://www.pledgebank.com/ ht

I think this is what Esperanto did in the beginning but I can't find a reference for that at the moment. Ironically, I found this, http://www.pledgebank.com/ http://www.pledgebank.com/, which is pretty much what you're asking for.