If you look at my avatar you can see that I have a Kanger Protank II on a Kamry E-pipe (with airflow). Over the metal drip tip I have stretched a standard disposable
tobacco pipe rubber tip and then squeezed a bent flat tip onto that. It feels great in the mouth, hangs nicely and is ideal for gnawing on.
I found the flat tip at a vape
shop attached to a really crappy plastic clearomizer for $3. It is really nice and not plastic feeling at all.
You could take an old pipe and saw the stem to the desired circumference. I did try this but I was overwhelmed by the stink coming off it and when I boiled it it turned white and disgusting- so maybe not.