I'm keen for this too. I also have an idea.....thinking plastic mud guards which are pre shaped with curled edges could be adapted and fitted. Deliberately free of the wings themselves on the inside but well clear of the wheels to remain hidden for the most part. Secured by stainless steel brackets to the chassis etc
I manged to fit mine to the car before taking patterns but they are for early inner wings which have been modified a bit so wouldn't be much use. I think they are a good idea for keeping mud out of the mud traps.