Trying to say aloud what I know: * HiFo is legal, non-profit organization based in USA. * e.V. is legal organization going to be based in Germany. It has to have seven (or more) founders (EU residents) who will be ordinary members. e.V. and HiFo could co-exist. Or e.V. could replace HiFo. Or HiFo could stay as it, without any e.V.
About EU citizen-or-permanent-resident restriction...
One stated problem was that HiFo's accounts are 'frozen' due to bank not accepting new board members.