Kouri,
I wish you luck in your experiments, but I think your best bet is a Deep/Photo Red main LED inside of a thick-walled red dayblade. End result should be a bright, rich red core with a dark red "aura". from the red polycarbonate walls. Amber might make for a good FoC in that setup, though I might recommend Warm White.
Thank you for the suggestion and guidance. I'm already sold on Photo Red and will be applying a DR/DR/A setup paired with a thin-walled Red Day Blade. There's still time for me to procrastinate over the 3rd colour, if deviating from Amber to as you suggest Warm white, so *me reaching for my thinking Cap* that much is determined. Will see if I'm feeling lucky as I'm excitedly curious still about the Far Red as a dedicated non-mixed and its effectiveness when mixed. To take a punt, the proverbial cat will either land just on its arse or be killed.