You can use brown shoe polish to help with the scuffs. That kiwi paste will work. If the stitching is light colored, shoe polish will "dye" the thread. I don't think you can hurt that one easily. Lexol conditioner is good. Mink oil may darken it some but will add water resistance as well
By the way, you are not a bother and I am glad to hear from you. Take care
By the way, you are not a bother and I am glad to hear from you. Take care