Simple solution.

Write a follow macro that you only use when flying, that targets the slave toon of your choice.
For mining or herbalism you don't need to level both of them as professions. You could just take them on the toon so that you see the items you want on your minimap.

If you have the ability to switch which toon appears in the main window (pip) you could quickly switch to that slave toon for flying.
Or if you have a decent size to the window can just make that window focus and lead from there.