Update:
Heard back from D5T5 regarding the SCL deactivation through VDASH.
"SCL disable removes the SCL functionality, it stays unlocked forever and cannot fail anymore.
It has to stay in place, as it is still part of immobiliser."
So it looks like for approx $100 we can just disable it and not worry about it happening again. I suppose I'll grab a new battery charger and go about unlocking the CEM then.