I have read your logic Cat3, and we are going to have to agree to disagree. Your logic contravenes 5 editions of how things work, don't hold your breath on that one, half the errata team has already posted in here telling you why it won't go your way. Ranged astral effects == spells, not foci.
But SSDR, is right, regen is actually very rarely an issue in gun fights, so long as the target that lack Immunity to normal weapons or hardened body armor. Most Teams will find filling something so full of enough hole that it won't get back up to fairly easy, if your team isn't one of them. Then maybe it time to invest in some firepower. An Ares Alpha goes a long way to filling things will meaningful sized holes.
Or any of the other solution i suggested should get you there just fine. Why not consider another option? Despite your assertion to the contrary, the finger thing is both not RAW, and not RAI. That won't change. But guns work, spells work, running it down with truck would work great. Free your mind the rest will follow.