That is about 5K base miles in D and 3K in "Y". Is it really in full-fare Y, or in discounted -- the exact fare code matters a lot for BA, as discounted Y fares earn only 25%. Probably BAEC is the best plan for you, however BAEC does not allow joining until you fly a BA flight on a premium fare, so unless you already have a BAEC account it isn't an option -- they won't open an account on request any more. You would have to take a BA flight in club prior to your trip.

On Qantas FF plan you would earn enough points for a one-way 600 mile award (so you could do TXL-MUC which is 300 miles and go via LHR, HEL, MAD and soon BUD). So the points are not quite orphaned (but almost).