Just an update, after fiddling with painting a test globe I got a bit frustrated.
Instead I used four layers of green cellophane gift wrapping taped onto the door handle moulding. Access to the globe requires the whole door lining to be removed, whereas the moulding around the door handle is a single screw and clip in fit. There is a plastic diffuser between the globe and the frosted window moulded into the door handle surround moulding so heat from the globe should not affect the cellophane.
The colour and brightness seem just perfect, a bit dimmer than the original setup which seemed too bright to me. Less layers of cellophane (two layers) gave good colour and similar brightness to the original setup.
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