Assuming 1" is for the steer tube, handlebar clamp size/diameter is.....? Probably also 25.4mm if an MB-4?
How much horizontal rise do you need for the bars? Salsa quill stems tend to have very short quills, can't get bars up very high.
Do you care if the horizontal part is horizontal to the ground ("7") or rising?
The Salsa stems with removable faceplates were called S.U.L. iirc, sold after QBP bought Salsa, and there was a recall. If you're looking at one, make sure it wasn't one subject to recall.
Most of the vintage-ish 1" quills with removable faceplates I'm familiar with are going to be road-ish VO/Soma/Blue Lug/etc. That's where I'd start looking, anyway.
There were some nice Nitto 1" quill/rem-fp stems, with medium-short quills, slight uprise, only two bolts. I've used 'em without problem, but some folks like Bulgie do not like 2-bolt stems. 2-bolt means zero insurance if one bolt fails, where 4-bolt stems give you a shot at keeping the bars attached if one bolt fails. Since you're talking about a "camping rig," 4-bolt likely a better idea?
Paul Brodek
Hillsdale, NJ USA