I have a 1547/Challenger 285B same tractor, different color. I purchased a factory block heater for around $ 75 bucks. Installs in one of the freeze plug holes. First try it leaked. Second try a bit of prem-a-tex #2 around the o ring and the leak was gone.
Plug it in for an hour and it starts in and instant. No clatter out of a cold diesel motor. She likes to warm up before start. All diesels do.
I added the two factory remotes. Maybe a two hour job. Get ready for some cash to go out of the wallet. Everything fit as it should.
My labor, free, personal satisfaction,free. Can't put a price on that.
Thats how I'd do it.