I have found block & oil pan heaters to work very well for equipment with a known usage cycle. e.g. Manure spreader tractor, which is typically used on a known schedule. Parked in the shop with a coal stove trumps everything, but the Perkins setup is indeed very simple and effective.
Have you ever seen a "Hot box" type heater like they use in Canada? It is a small heater that burns diesel and circulates the coolant through the block. Very useful for offroad equipment that is not parked near electrical service.
Excess fuel for cold starting...have you ever started a 30/40/50 series John Deere on a cold morning? In the injection pump basically allows extra fuel to be delivered until there is sufficient oil pressure. I used to spread manure with a 4430 just like this one...sounded exactly the same.https://youtu.be/3wRcjAPKMGA