Bypass hose and fitting dilemma

Go down to HD or Lowes and buy a 3/4" nipple x" long, say, 6. If you don't have some way to clamp it without thread damage, buy a coupling "or something" so you can clamp it in the vise. Go home, saw the thing off so you have threads and an appropriate length of nipple, and install your hose.

If you are "inventive" you can pliers tighting the thing "way out" at the end so the hose goes over any scarring and the clamp is up near the threads, IE it will seal