Okay, I've finished the second prototype and it works well. Check out this video:
Sorry I've had to rename it "Neal Tip #2": when I entered "Bite Neal Tip" as a title, Dailymotion apparently thought it was some kind of BDSM video and rejected it
It can do direct lung hits very well, and mouth-to-lung also. However, in the latter case, since you have to clamp your teeth on the tip, you can't draw as much vapor as you would if you could open your jaw fully. I find the best way to do it is to fire the mod a good second before taking a toke, and then take a slow mouth drag with the airholes wide open. When you "run out of mouth" so-to-speak, slowly open your jaw until the mod stops, then pull briskly what's left of the vapor in the atomizer. It definitely takes some getting used to, but it's doable.
As you can see in the video, there is no contact between metal and your teeth. What you bite on is a piece of rubber tubing. It's rather safe I think.
So now the question is: what do you want me to do with it?
1/ I can send you the Neal Tip alone, and you get a friend who can work a soldering iron to externalize your mod's firing button for you
2/ You send me your mod, I rig it then I ship it back to you with the Neal Tip (no guarantee that I won't destroy the mod in the process though: the electronics in them things are usually very small and very, erhm, Chinese.)
3/ I buy a mod locally, I rig it, then ship it to you with the Neal Tip (again, no guarantee - same as above)
4/ I sell you my Dovpo E-Mech (the one in the video) which is already rigged, and I ship it to you with the Neal Tip. It's not the most exciting mod in the world, but it works well. At any rate, it's not worse than an iStick 30, but it's certainly a lot bigger, being that it has two batteries.
5/ I keep the Neal Tip and you get a handyman friend to make you a copy. It's not terribly complicated to make, I can send you some drawings.
Or if you want some other arrangement (or you don't want it anymore), let me know.