I think you're basicly looking for a 'top feeder' to strap onto your 510 batt, I haven't seen any commercially available(but, I haven't seen everything). Maybe look in the modders forum and see what you could adapt?
On removing your bridge: I saw some vids posted the other day, but I'm too tired/lazy, and it's too late for me to look them up... try searching 'bridgeless atty' or 'removing bridge from atty', and I bet you find it (I know MistressNomad just posted a review of how it worked for her w/ youtube links)....
Also there are some cart mods out there that help with 'tasting that lovely filling'... right now, I'm using my drip tip to drip into a carto, b/c I have to drip (slightly) less often then I do an atty...
Hope that helps...
-=BoB=-