If you have one of the new Paragon 4 equipped locos, the P4 decoder should support what BLI calls a "Pro Mode" independent lighting, in addition to the default auto on/off function. The N scale mikes/pacifics do not have a backup light as you note, but the decoder should have the capability of independent lighting. Having said that, I've yet to open mine up to see for myself. Maybe a call to BLI is in order, as suggested. And let us know what you learn please.
Otto