Guys! PO drove my car for many years near the Arctic Circle with a block heather mounted at the back of engine in the freezer knock out lid. It works wonderfully even today in the middle of the country at minus 24 C. Has an outlet for a cabin heather as well but seldom used as cabin heath comes rather quickly with the preheathed engine.
Start-stop is controlled by a timer. Recommended start time is 2-3 hours before use of the car and it fires up is amazeingly fast. Brand: DEFA (Norwegian I guess). Search
DEFA and go from there. Good luck!
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Lapponia 944 Na 1984