I never add anything to the sole, but if I need them resoled I go to Dior (or John Lobb the other brand of shoes I wear) and have them resole them. I only need to do it every three of four years, if that, but I have a rotation of shoes.
If these will be your go to on consecutive days, then you might want to get some extra protection on the sole which is cheap but make sure it's done right.
There's something nice about having a real leather sole hitting hardwood, but not worth the trouble if these will be getting a ton of use.
I bet they look great!