Excellent idea retaining red and black for low voltage. The last thing you want to do is to mix up mains supply and low voltage.
It might well be the last thing.
When I took my pre-apprentice exam, the training officer wandered through the room with some bits of faded coloured paper, doing what turned out to be a colour blindness check. It was OK with the blue, orange, green and brown, but when I said "grey" he gained a concerned expression, and after a bit of prompting, got me to agree that it could be called "slate".
The firm called "grey" "slate". He was incapable of realising, having had it dinned into him for so long, that to an outsider, grey was any of those combinations of black and white without added colour, but a look out of the window would have revealed slates of varying shades of purple/blue and green, depending on where they came from. No grey ones, though.