Balance wise, this would be problematic. Tl;Dr at bttom
All 5 breaching Ops you’ve mentioned have major draw backs.
Ash: Gets long range, instant breach rounds. However, she only gets two and can’t be used on Reinforced walls.
Sledge: Gets a huge number of uses (25) and it instantly makes a hole in allow access into a room. However, it can’t be used on the ceiling above and if there’s an enemy immediately on the other side your likely going to die due to the animation of putting the hammer away. Also can’t break reinforcements.
Buck: Limited Ammo and doesn’t make holes as effectively as the others mentioned so far, however it has the most liberty with the size and shape of holes made and can be used on ceiling above. The animation from Skeleton key to Rifle is also negligible so it’s safer for close range.
Hibana: Long range breaching pellets. Can blow open reinforcements. However, they are effected by Jammers and Batteries. The long time to blow and the visual effect on the other side makes them ineffective for soft walls. Also make the smallest holes of all the breaching gadgets.
Thermite: Can blow open huge holes in reinforced walls. However, effected by Jammers and Batteries, can’t be done at range and as well as the long detonation time, there is a long plant animation making Thermite vulnerable to the Bandit trick. And he only gets two charges.
Spark: Has (almost) Bucks liberty of shape and size, goes throw reinforcements and cannot be countered by any gadget currently in the game?
Tl;Dr Seems a little OP. The main trade off for Buck having this freedom is the fact that he can’t open reinforced walls.
As for the name, I’m really not sure what name would work for him.
I don’t think Widow’s net not effecting friendly projectiles would be an issue balance wise, just in terms of realism. But, then again, the Defenders do pull entire wall reinforcements out of their ass. So that’s not an issue for me. I think enemy gadgets only is definitely the way to go.