A loose keyboard/mouse/display on stage is not an option.
If having a Studio and a MacBook on stage is acceptable then surely having a Studio and an integrated monitor, trackpad and keyboard is also acceptable?
There are lots of options, here’s the first search result:
15.6inch Full HD Portable Monitor Built-in Keyboard and Mouse For Raspberry Pi Samsung Dex Macbook Por Laptop PC Sub Display
Smarter Shopping, Better Living! Aliexpress.com
This seems so much simpler, especially if latency is of any concern at all.