Large-area paint damage – Have it repaired or work with a paint pencil yourself?

Hi, I’ve got a Yaris BJ 2005. Technically still great in shot. Unfortunately today I cuddled with a garage column (see photos). Someone from a free workshop meant if it doesn’t matter to me optically I could just get over it with a paint pencil. Currently this is still my preferred option. Alternative would be to activate the comprehensive. Here I have 300€ excess and a contribution increase as cost point (effectively about 400€?). Probably not worth it any more, as the Yaris is probably only around 1000€ worth. What opinion since you? Can this even start to rust if this is only processed with a paint pencil?