If someone is determined to do this, then work on a Sabot to carry the shotbag. A projectile that has a good seal, is well-lubricated, and will carry a regular shot bag will shoot a line well beyond the height of any tree.
Gadgets are great but skills are needed also.
It only takes a little more skill, patience, and determination. A piece of octagonal pruner pole with a mounted Big Shot couples right on top of this with a piece of PVC pipe. The Big Shot, the pruner pole, and the coupler go right into the back pack with the ropes and saddle. I might not be able to place a line into some of the trees on the west coast, but here in the east, I think that I can get a line into any tree out there. And it is a whole lot easier to carry around than the spud gun.