Agree. the cheapest is to remove the plastic cover (including the fans) and just attach a normal fan.
if the card IS the one like in this review then i'd say 3x of 92mm fans should be enough to cover the lenght of the cooler.
then i would look something like this. Heck, even aftermarket coolers sometime just use normal sized casing fan.
take Deepcool's vga cooler for example