There are warm white CFL and led bulbs. All fluorescent lighting will take time to come up to full brightness. Led bulbs like the Philips L prize winning bulb can be dimmed and do not have the delay associated with fluorescent lighting (CFL included). Halogen bulbs run far hotter than the typical incandescent bulbs and would require the appropriate fixtures.

you are just going to have to get samples and try them out. have no idea what your room looks like or the type of light you get. what you don't want are cool gray colors. red oak is warm,,,you need a warmer gray, or a neutral gray. (BTW,,,I have Silver Half Dollar on my walls and it looks like a baby blue. I get afternoon sun in the room and they are tall ceilings. It's very blue once up. I have it paired w/Kendall Charcoal and silver travertine, so it still works. but w/a red oak floor, I'm thinking you won't like it) Get some samples! some of the colors you picked are on this,,,next to a cool, blue/gray tile floor. to me, these two tones clash. you may like it.

To compliment the maple floors I would use a light olive green with a grey undertone like Benjamin Moore Old Prairie 2143-50 or November Rain 2142-60. Since they are on the lighter side they will help the attic feel more open and the warmth of the green undertone will make the space feel cozy.

You are right about the North facing rooms being difficult to make look brighter. Usually White Paint in a North room doesn't work. White paint needs light in order to make it look white! That's prob why you have difficulty. plus, it's usually a cooler, bluer light from the north. AS you can see, your winter white is a gray/green undertone. not the best color to have in a bathroom! Definitely not a warm white! Vanilla Milkskake is a warmer white. leans on the yellow/green spectrum though I tried White Dove in my room (west/south) and couldn't stand it. too dingy looking. I painted over it w/Simply White. White Opulance is a nice white. but it's a red undertone, not a warm yellow. (has a very slight pink hue. This one would actually be better in your bathroom) You should read those links I posted above. she talks about diff light from diff directions and gives paint advice. https://www.kylieminteriors.ca/the-best-most-popular-benjamin-moore-paint-colours-north-facing-northern-exposure-rooms/