@ntardif-glowforge, I’m not sure how this one slipped through the net.
I’m a little confused by some of the explanations there around the environment variables pre- and post- offline update. I am going to throw a link in here to something created by a user for offline updates, which seems to have some element of variable configuration options: Interactive Bash script that performs a Balena Offline Update on an SD card. Does this help at all with your initial question?