I’d get a battery powered electric generator (like an EGO) to plug a CTEK into. Can’t imagine it will use a ton of power so it should last for a little while before you would need to recharge the EGO batteries. The car will be just fine for that short period of not being plugged in.
I say don’t bother with it yet but if you want you can use this to figure out the math.
https://www.supramkv.com/threads/oil-level-analysis-with-ecutek.10943/post-182251