Well, shadowfax beat me to it.
The area immediately surrounding the heater would be warmer but would it have any appreciable effect on the overall problem, no.
When you’re brainstorming and the idea you come up with isn’t going to realistically work, you can expect others to weigh in saying so. If you don’t want anything but praise for your suggestion, then maybe this isn’t the best forum.
If I had a solution that would solve all of these problems I would already have a patent on it and be relaxing by the shore of some tropical island, as far away from needing a block heater as possible…