prepending a custom list of paths to counsel-locate results list #373

I would like to prepend a list of special files to the results of counsel-locate each time just before it is called. So that they are up to date and included and filtered by the entered search pattern and appear at the top if they match.
How would a proper recipe for that look like?

I found something about virtual-buffers here but I am still not sure how to go about this in general.