Just to clarify here. Red is right, legal everyday carry requires a 3" or sub 3" blade that is readily foldable and has no locking mechanism. This is a no questions asked legal right, but with exceptions. However, locking blades are perfectly legal EDC as long as there is a reasonable need to carry one. Can't really deny a carpet fitter a Stanley, but I'd hope he wouldn't take it to a football match sort of thing.
The OP mentions a work back up, so locking blades shouldn't be discounted from the thread.
I think a multitool would make a good backup. My Leatherman Charge gets a fair bit of use. I've added a bit extender and some extra bits for versatility. I'd recommend a Charge. Swisstool is king though, but I've never justified my usage to the cost.