I would think whatever you put on the seal to protect it will also negate the seals reason for being there
FWIW, the black doorsill guard tape works pretty well. That would allow you to put your foot further out on the painted surface and mitigate contact with the door seal, maybe?

FWIW, the black doorsill guard tape works pretty well. That would allow you to put your foot further out on the painted surface and mitigate contact with the door seal, maybe?