As discussed somewhere above, it should be possible to backdate B.R. green - IF Hornby ever produce them - to Bulleid insignia ( but not so simple t'other way ) ....... window labelling would be a hassle as nobody does the late S.R. 'NO SMOKING' triangles.
White windows are, indeed, a pain ......... IF that section of the glazing strip can be separated and removed, a dip in Model Strip ( or whatever it's called nowadays ) will get rid of the paint - DON'T as I once did leave the windows to soak overnight as they'll end up completely white throughout ! Use a fibreglass pencil to frost the inside of the 'glass' before returning to the coach or - if you can't extract it in the first place carefully / patiently scratch the white off with the bent end of a scriber.