KC for switching tools in VariAudio editor?

Surely I am missing something, but I cannot find a way to assign a KC for switching between “Pitch and Warp” and “segments” tools when using VariAudio. It is so very laborious to need to always go back to click the other button?

I am missing something here or is Nuendo missing something!?

The “tab” key switches between P&W and segements.