Car window seal repair

Assuming your car is not an unusual model, I would try a Breaker's Yard if you've got one nearby. I would guess that damaged doors, maybe with broken glass, aren't unusual. You should be able to "harvest" a rubber seal without too much difficulty. Getting it into place after removing the old one from your car door may be another matter, however.

A model makers or surgeons scalpel is more controllable. You will need a steady hand. Scope for further damage.

That is likely to leave finer scratches but might work. I have found black sugru (sp?) quite handy for making semi flexible repairs to damaged boot and door seals in the past. Though these were not cosmetic but gouged out chunks from manhandling heavy sharp gear in and out.