It's easy to find a standard lamp with a white or buff shade. Could that be painted? With fireproof paint? Or covered with fireproof paper? Or cloth? Or Solarfilm heat-shrink covering?
both yes, but low light transmission so it wont be good
lining it with the cheaper type off plastic lighting gel would work, but best to just buy a red lampshade. If you can find what you want, strip the cloth/paper off the old one and redo it using some very thin high light transmission cloth, the sort of thing used for linings etc. Paper works too but has poor light transmission, giving a poor lighting pattern. Nylon has highest light transmission and diffusion.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.