Easy way to switch between vocal assistants?

…i’ve successful upgraded to voice commands, and all works well on my android phone, except for the missing widget (if someone has some hint…).
When i select Assistant as my default voice assistant, it is shown as a popup (like Google assistant or gemini), but if i make a shortcut, it opens the companion app before showing the popup…

So i’ve tought if there is a way (Tasker is not free, maybe Automate), to change instantly the assistant in the settings, or if there is a way to ask to gemini to chat with Assist, and vice-versa.

Last (and the most beautiful as impossible) is “Gemini tell to Assistant to switch the light on”.

So… how would you do it?