Don’t put put 2 wires on the same screw. Do it right and splice a pigtail

Honestly I wouldn’t really worry about it until you go to replace it completely. K&t out in the open isn’t usually an issue. It’s when it’s buried in insulation that creates a heat issue. The outlet I presume is behind the stove so there isn’t a lot of use/ wear and tear on it. And the igniter and clock draw next to nothing