So this was the compromise....
I bought a chalk pen (which I LOVE) for $3 and revamped the doors with a free hand fish scale pattern that has added a bit of dimension to its otherwise red block shape. I think I'll change the pattern in a few weeks... thinking a lattice Hollywood Regency inspired pattern for next time.
This was the fab product used - chalk maker by Mont Martre - removable, weather proof and leaves the look of chalk lines but functions like a felt tip pen.... you will usually see them used in a lot of cafes and shop windows. I'd always spot test your surface first to ensure complete removability prior to drawing on a design.
Have a great weekend