nice bump!
i hope the brooks tape works out well. since you revived this thread, i guess its worth mentioning that i ended up succeeding in my mission of matching my bars to my seat... temporarily. i used brown cloth tape from velo-orange, and after about 7-8 coats of amber shellac, that tape looked EXACTLY like my brown brooks saddle.
SUCCESS.
the color match lasted for about 2 weeks, at which point the saddle (as expected) naturally darkened and the tape/shellac (unexpected) lightened. now my saddle is dark brown and my tape is an ugly shade of brownish orange. i'm retaping it soon (white tape this time) and i wont be using shellac again. in the end, it was a fun, pointless project.