Tailscale running at home and on campus. Run the bash script from a terminal from inside tmux. Then you can always ssh directly to the campus machine from anywhere regardless of what IP it has and attach the tmux session to your terminal session to see the whole thing.

For a random relevant data point, I just got this 2TB usb SSD for $130 to use for temporary machine imaging/copying like you are currently facing: https://www.bestbuy.com/site/samsung-t7-shield-2tb-external-usb-3-2-gen-2-rugged-ssd-ip65-water-resistant-blue/6501719.p?skuId=6501719