How to make character activate 2nd controller (vehicle) in-game

I am looking to combine 2 projects.
“The Community Project] WIP Weather & Ocean Water Shader”
And “Inventory with UMG”

I have been trying to figure out how to have the playable character have the inventory/HUD of the “inventory with UMG” While activating the Ships Vehicle Controller on contact with the ship so he is able to drive it.
I can manually switch out the controllers and it works, but i cant get the inventory/HUD to work with the vehicle controller.
Please help!!!