No problem at all...
Yes, just add the low cure additive to the plastisol per the manufacturer's instructions to print on the polypropylene bags.
Curing temp is in Fahrenheit.
The dryer element temp will always be higher than the cure temp. You can either speed up the belt to make it go through quicker, or move the heater up/belt feed down to increase the distance between the heating element and the bag. You may have to do both, but it will take some playing with to get it figured out on your equipment for the proper time and temp. Think of it as a pizza oven from Domino's or Papa John's. The slower the belt, the longer the pizza is cooking. If the oven is set to 500, too slow will burn, too fast will not melt the cheese, but just the right speed it comes out perfectly cooked. Same principle, but the cheese is the ink and the crust is the bag.