FWIW, I would do the never before DEMONSTRATOR Scheme...
Early Milwaukee road paint of Grey Top, red Stripe, Ornage bottom w Black sidesill and trucks. 10L45 under cab windows centered FM logo and Fairbanks Morse written out along the bottom of the cab and stretching out the "Art Deco" walkway.
Cast FM Medalion on the front.
A colored picture can be found in the book Diesel Demonstrators by Karl ERK pg 111.
IT looked like this without the bell on the front hood..
https://www.thedieselshop.us/FM_H1044.HTML
former FM demo unit ex MILW 1819 now MILW #777
member:Golden Spike Club Charter Member