i love deep drop track bars myself, 3ttt pista bars come to mind, but what does that have to do with your headset, stem, and fork being threaded or threadless? you are currently running threadless, yes? 1" or 1.125"? it seems if you're trying to save money while revamping your bike, shouldn't you just paint it and get the bars you want and call it a day? swapping a fork or having your current one threaded and replacing your headset seems like a lot of unneccesary cost if trying to save money. i know it's your bike and all, and i'm not trying to dissuade you from anything. i am just trying to better understand your motivation for the swap. threadless is lighter and i think way easier to adjust and work on.