Thunderbolt display – How to take advantage of a desktop iMacPro with a Macbook Pro?

Trapped at home with COVID (undiagnosed, but shelter on site). My business will not allow me to install VPN software on my desktop (an iMac Pro). However, I have my Macbook Pro 16 with me which has a VPN.

I was hoping to be able to mirror the screen via Thunderbolt to be able to take advantage of the larger monitor. I was also hoping to reuse the wireless keyboard and mouse from my iMac Pro.

Is there a simple way to turn the iMac Pro into a screen while (easily) switching the mouse and keyboard between the desktop and the laptop? I'm fine twice a day reconnecting Bluetooth to each other if necessary, but hoping that there is a lighter solution.

Stay healthy and safe all!