I feel like “look at twitter” is probably enough of a defence to decline president musk.
It would probably need to be wordier for court proceedings.

USB as in USB-C?
If the display is HDMI in, you can get HDMI auto/priority switchers. IE, will switch to the highest active input.
Then get a USB-C cable to HDMI, and a plain HDMI cable for the other input.
That covers USBC & HDMI.

If you want something more fancy,
https://www.amazon.co.uk/KVM-Switch-Monitors-Computers-Keyboard/dp/B0DNYVGRZZ
Or,
https://www.amazon.co.uk/Anker-Docking-Station-Laptops-DisplayPort-Gray/dp/B0C7QVL2RT

If you are a larger company, it’s worth talking to an AV integrator.
There are many ways to do this.

This is how trump operates.
Postures, bullies, makes loads of noise in order to get what someone else has already agreed to.
Then, cause he was so noisy about it, he gets all the press coverage, and the neo-nazis chock it up as another win

My experience of checksums are in things like serial where they can potentially recover a corrupt bit.
I presume in the case of encryption, a checksum is more of a hash of the raw data? Like a one-way deterministic compute. Easy to get a hash of data, extremely difficult to get data from a hash.
In which case, it’s fine. Passwords are hashed (granted, multiple times), but a cryptographically secure hash is not to be underestimated.