Ended up with an old Salsa Bell Lap bar.

I'd actually found this at a swap meet a few months ago, never used it, and traded it to a friend for a saddle. Texted him yesterday, he hadn't installed it yet, traded back.

46cm, 12 degree flare. extremely lightweight. I'll have to use a shim as it's 25.4 clamp size.

(I also have a very compact drop bar in the parts bin that I just measured; 30cm and flared to 38cm at the drops. Never considered it because it is so dang narrow. However, I may try it on the '95 Specialized Hardrock I've been converting to drops.)