I did the opposite and purchased an flat upper tree from a guy in the UK. The shipping was £15.00 GBP (~US$28) and takes about 10 days.
I have the old upper and caps, if you don't find one in the UK, let me know and we can work out a deal. I also have the stock bars (slightly damaged) and a new set of flat "drag" bars. The drag bars (no, they are not wearhing fishnets and high heels) were a nice split between clip ons and the stockers. I thought the stockers were too far back and they were way uncomfortable for me.
BTW, the clip ons you have will not work on DogBoy's conversion because of the USD forks diameter.