Thanks everyone, though none of the suggestions helped.
"Context Bookmarks" addon looked great, but it wouldn't let you have one or two individual bookmarks in your context menu; rather it just creates a submenu of your entire bookmark collection. This actually increases the number of clicks compared to accessing your bookmark in the default method.
"All Customized Links" seemed like it would do the job, but as Curt mentioned, it's not updated anymore. I could 'force install' it using the Nighly Tester Tool, but do not like the idea that all my bookmarks would be 'remotely hosted' with them.