Umm yeah I’m probably just going to find another hobby…
tape a mirror to the tank so the tang attacks it’s reflection instead of the angel.
Next time have a plan before you get home. Spend money on said plan like acclimation boxes and mirrors before coral beauties.
And no a fish can not sit in a bag overnight as it will run out of oxygen.
Whether it works long term depends on the tank size, territories, and individual fish personalities.