there is no such combination,but you can try a max cyan setting and check if that leaves you sufficient luminance to see the image. it should protect the paperadequadtly.
I don't think so. Paper is blue green sensitive.
cyan lets blue green through; it is minus red. it will thoroughly expose your paper. There seems to be some confusion between a red filter and minus red in this thread.
"There are a great many things I am in doubt about at the moment, and I should consider myself favoured if you would kindly enlighten me. Signed, Doubtful, off to Canada." (BJP 1914).