You don't need to use hotkeys, in streamerbot you can directly control the visibility of a source.

If you right click on the source you can set show and hide transitions, I believe I used slide for both of them.

I'm going to shamefully admit that I did maybe like an hour of Waluigi Karaoke in the car yesterday and it might be the funniest thing ever

Buster 1-60 UF
Wizard Arc T 9-60 R
Whale 3-60 F