When looking at some utilities for the MacBook I mentioned using Amphetamine to temporarily stop it from sleeping with keyboard shortcuts.
The helpful comments on that post gave alternatives including just using the 'caffeinate' command from Terminal and forms of automation such as Alfred.
While doing a bit of digging I came across the little tool "iCanHazShortcut" which lets you assign keyboard shortcuts to anything that can be run from Terminal.
Goodbye Amphetamine, hello ICHS!
I now have:
⌥ + ⌘ + = for:
caffeinate -dt 3600
⌥ + ⌘ + ← for:
It's more flexible and I don't need to have the icon in the menu bar.