Mount Vs Pet

[ICountFrom0]

Mouse and keyboard player. PC.

When I have my pet out, I want the pet bar to be active and not replace the bar 1.
When I am on a mount, nothing in bar 1 matters, so I want to replace bar 1 with mount bar.

How do I do this? So far I've figured out how to do one, or the other, but not both at once.

Also, if I have a pet out AND a summon a mount, could I get the mount actions on bar 1, and the pet on it's own bar, at the same time?

Closest thing I can manage is, pet bar exists. When mount is summoned, both pet bar and hotbar 1 both become mount bar.