Adding a rockpi as a network device to a host pc. I.e. networking over usb. Could be useful for low-latency vnc streaming.

Extensive hardening guide from kernel, firewalls, swap, to userspace and more, covering pretty much all eventualities

To switch between headphones and speakers in pulseaudio activated pc quickly:

pactl set-sink-port [YOUR AUDIO CARD] analog-output-headphones | analog-output-speakers

Connecting ipad to raspberry (over usb vnc, so latency should be minimal) to enable a linux desktop experience (ssh or vnc).

Then connect a keyboard and you should be off to the races.

An incredibly thorough guide to online anonymity (and/or privacy) from laptop and phone handling through encryption to password and identity management.

Most flexible solution to the problem should be some variation of:

find $DIRECTORY -type f -print0 | xargs -0 stat --format '%Y :%y %n' | sort -nr | cut -d: -f2- | head