but for the radium burn I would suggest you to use transparent color and dye pigments.
(citadel shades are perfect for that plus AK patina pencils).
radium burn on a dial is a very slow process and quite homogeneous if the watch hands were in motion for long so replicating it will require a radial approach and less of staining.
Staining usually happens in the lacquered layer.
In this example most probably the watch was kept for years in the position it has stopped, at 8.05