Any way to retain a temporary drive folder as a favourite

Is it possible to have a folder from a temporary drive as a favourite, which shows when the drive is connected but not when disconnected.

I have an external drive connected directly to my Mac which contains a work in progress folder. I can add this folder as a favourite in the left hand pane. However, If I work remotely, I don’t always take the same drive with me, so consequently, as you would expect, it doesn’t show up as a favourite. When I get back to base and connect the external drive, I would like that ‘favourited’ folder to appear again, but it doesn’t. Not sure if this is possible at all. Any ideas, suggestions welcomed.