Good day:
I carry a Zefal HPX-4 frame pump on my Disc Trucker as depicted here. I'm looking for a similar frame pump with a flexible length of hose for the valve connector. This pump just affixes to the valve step. It's rigid and (knock wood) it's only happened once where I wasn't minding my aggression and I snapped the valve stem as I was filling a tube after a flat. Whoops. I always carry at least two tubes so I was good, but I'm just looking to mitigate the risk.
My bike has Presta valves, but I'd like the ability to swap to Schrader, as I often stop trailside and help folks get going again and I like options.
I carry a Road Morph on my other bike and it's fine pump, but I'm looking to see if I can find anything that fits on the nub that's underneath my top tube. My top tube is around 550mm, FWIW.
If there's a better forum to solicit ideas on this, let me know. But bike wrenches usually have a good, broad view of what's out there.
