the only oint of having a "drag wheel" is lightweight and width for some fat tires.
There are numerous rims that are mad that weigh less than 20 pounds.
Enkei makes a few rims that you can custom size, width spacing, offset etc and they will weigh about 15 lbs. they may not be the hottest rim, but it will get the job done well.
a lightweight 17" with some drag radials will improve your times significantly. if you have a problem getting traction and a good launch on the stock rims/tirs, a good set will help you shave close to .5 off your time.