Engine pre-heater

If you can't fit a conventional block heater in it there are in-line heaters that warm the anti-freeze & the block. Most larger automotive stores carry those as well. In addition to the Magnetic heating blocks sold at farm implement stores.

And of course there is always the tried & true "Garage."

PS if you're really "cheap" put a 150 watt flood light on the engine overnight as the engine's cooling. That's what the old Mercedes Diesel crowd does up at the cottage.

:-D

What's wrong with an old dipstick heater? I have one in the basement that I used years ago and it worked very well.