Hmmm, sorry about my silence, I don't appear to be getting notifications.
Many thanks for your answers.
The use case comes from having colour coded VIs for specific functions, going from the project is too slow.
I didn't think of express VIs, this might give me the immediacy I'm after. (I'm after 2-3 clicks with no navigation from the block diagram ideally)
A quick drop short-cut could also work nice, although having such things in the function pallette is my preferred option.
The issue with a tool is similar to my issue with coming from the project, it means navigating away from the block diagram.
I really wasn't expecting this to be so tricky. It's interesting the things that catch you out!