i got the certificate signed by Hanse Merkur Versicherumg. Check it out , its also quite simple to adjust your insurance to your actual needed length ( during a visit to Germany ! )
Yep,thanks for the wishing that they will accept their own formular. I prefer a proper insurance with unlimited coverage and no deductibles for my O-A visa stay. I will report back when the time is coming ... ;)
I've just done reregistering same address in Phuket and using drive thru at immigrations. Very convenient and quick. They simply updating the TM30 slip in your passport. Took 5 minutes.