Might be "just a cruiser", but if someone pulls out in front of you, you still have to stop 3500 lbs of car. Personally, I'd do the disc brakes in a heartbeat, and never look back.

That said, it probably would be easier to adapt the lowered aftermarket spindles to accept the drum brakes then it would be to build a lowering spindle for your drum brakes. You really only need to find a way to mount the drum backing plate and have clearance for the brake hose to pass safely through everything with the suspension travel and with the spindle turning right to left. The drum, like the rotor, won't care at what height it is attached to the spindle, it only has to clear things as it spins. Gene