Custodes with battle wear

I want to get some custodes painted with battle wear and with a white gold color tather than the typical color. Not a different scheme than the original (like shadow keepers), just a white gold lighter color. How hard is it to get battle wear on custodes? First I want to do these guys: https://www.warhammer.com/en-US/shop/Vexilus-Praetor-2018