the idea about dripping into a funnel shape that almost touches the atty has been done by someone on the forums with a plastic pipette and pen parts.
i want one that is machined... i'm sure some other people would be interested in that as well. taking the tip off to drip sucks.
At least for an 801, my T-Tip, while not funnel shapped, works quite well as a fluid guide. I never take it off to drip. To make it funnel shaped, you would restrict the air flow. If you do need that kind of pathway for the liquid, buy a T-Tip and solder a pin to the inside edge of the Tip, with the other end of the pin angled so that it centered on the hole. The fluid would slide down the pin to the center of the atomizer.
I'm surprised I don't see more about filling carts from the bottom with a syringe and needle. Since I started to do this, I get more vivid flavor and thicker vapor much like from dripping but its hours between fills. I really like the T-Tip but now only use it to try new mixes.