if somebody could confirm that it is the same testload as for the ddl driver (i think so since the testload is designed after the ld, not the driver, but i don't know the flexdrive...) i could make one for you.
depending on where you live you should ask around here, i don't know if want to pay the shipment from here (germany) to you (probably some other part of the world) for a device that's worth less than 2$.
//edit: if the rckstr fits you can take that of course. i guess the testloads are all the same?