Remember that coax is spec'd on the assumption it's a textbook install... No pinches, no tight bends, no issues with the connectors and a properly matched load impedance both in and out. In the real world RG-58 offers very little margin at QRO with the worst case being on the upper bands.
Considering the cost and easy availability of an RG-213 jumper I don't see the advantage of a thin coax with small conductors.
Well could use RG8x too. If you want a serious small jumper to pass through a wall use RG142, it will handle more power than 213.