Sounds like an application for a multitool to me. Caveat that a knife blade will limit where you can take it.
I know some people hate multitools as inherently less useful than dedicated tools - but where they excel is where you don't expect to do work but it might crop up. Then you want as many tools as you can reasonably carry so you can get the job done, even if it's awkward.
There's an potentially apocryphal story that Tim Leatherman invented the Leatherman Tread after going to Disneyland and being unable to take a multitool. That tool in particular though is even more awkward to use than any other multitool - but it CAN do things.
Especially for travel, if you're carrying actual tools, I'd pick the cobra pliers XS or the 125mm pliers wrench (XS may be a bit TOO small for the pliers wrench) over a small crescent wrench, but the adjustable wrench is a lot more affordable.
If you want a knife, consider buying a utility-blade knife so you can travel without a blade and just grab one from a hardware store when you arrive. The Screwpop is extremely light and useful.
A multibit screwdriver is nice to have just in case too - but which one depends largely on whether you actually plan to carry it. I really like the Picquic "The Pic", but I don't know if you can get it in the USA yet. It's light, pocketable, cheap and durable.
More info here.