Actually all BASE jumpers pro-pack - even you, Brian! The confusion here is that most people incorrectly think that pro-packing means doing it over your shoulder, while flat packing means doing it on the floor.
Actually, the 'pro' in pro-packing stands for Proper Ram-Air Orientation and is any pack job that is done so it deploys on heading. So this can be done over the shoulder like with most skydiving mains, or on the floor like with most skydiving reserves and BASE canopies. It's still a pro-pack even if you do it on the floor, as long as it is stacked with the nose straight down into the floor, the left and right side orientated as such and the tail on the top of the pack job.
The flat packing that you see done on student skydiving kit is probably better called side-packing, and the canopy ends up 90 degrees off heading - so, in that sense, it isn't helpful for learning BASE packing. But for learning which lines go where, it's good.