Author's setup doesn't really have that problem as far as I can see. AFAIK the cable from the xreal glasses don't even detach, keyboard and mouse are wireless. I guess you could forget the USB-C cable for power of the minipc, but you can get a USB-C cable literally anywhere. Or borrow one from someone whose laptop is already charged.

The 'problem' you describe is not much different from forgetting to bring the charger for your laptop. USB-C being ubiquitous made this so much less of a problem.