I would say yes. It is however much harder. I ( out of sheer laziness) did not use a template for my PrePro2 ( attached are some pictures). What I did do however was use s soft lead pencil( like a 6b) to draw on the rough design and placement of the damage and then used my silicone wedge brushes( found on amazon) to apply the maskol.
This is a bit harder as you have to keep checking the templates and really focus on making the damage smaller than your brain wants too( this is because mapping out a design onto a curve, from a template that is flattened out, distorts the proportion. Think of it like the flat maps of the world, they are accurate in thier shape but not thier size, this is due to taking an image from a compound curve and flattening it).
So yeah, you don't have to use templates as a stencil, but it takes more skill and patience.
Please note that the best helmet painters on this forum( jayvee, superseding, famous fett, ect) use the templates and transfer paper to map their damage, what they do is cut the templates up and align the damage like that. So they print multiple stencils of the same area and cut out the part or damage they want to map and line up that one. They then find a reference spot to align the rest and then do the smaller chips by hand. I hope that helps and I hope I didn't misunderstand your inquiry.
This is all just my two cents as a humble amateur playing in the Fett game.
