I want to do threaded to threadless stem conversion. I want to try the Jone-H bar on my 1989 Mariposa touring bike. If I get ambitious I'll also swap out the 700c wheels for fatter 650B's. Trouble is, over the years I've been raising the stem to compensate for my ageing, decrepit backbone. Acquired the bike in my 30s and now in my 60s. I rarely use the drops anymore. A regular length adaptor would be too short.

I figure I got a couple of choices: 1) a long stem adaptor or 2) a regular length stem adaptor with a 1 1/8 stem riser plunked on top. Seems to me both solutions are NOT particularly elegant. Either I've got the skinny pipe of a long adaptor erupting like a drinking straw out of the steerer tube with a fatter modern stem on top or I've got a three bits of hardware with the stem adapter, stem riser, and stem, shishkabob style.

What's the least gross way to do this? And, is there anything creative or eccentric I can do to add a touch of creativity to this project?

Thanks!