Warm white comet leds, 100 packs of 44 & 47s.

3rd magnet is a neat trick but you'll have to drill the PF for that.

It's up to you. I've often wondered if you had done your CV all warm white and not color matched would you even notice the diff'rence now? And if you did would you care? So for me, is it worth the effort and planning that goes into it to color match? Hey maybe it is to you, that's cool. Just gotta do the leg work and count up all you colored insert etc

EDIT: But either way I would go comet brand & frosted. They'll work everywhere needed
https://www.cometpinball.com/products/2smd-bulbs

I would advise against putting any purple lighting anywhere

Yeah it looks like garbage, amateur hour.

The magnet mod is just a magnet with a sticker on it that helps the ball stay in the diverter. Pinballpro sells them

I always advise against a kit, because you're at their mercy of what colors they give you.
Personally I like a warm white GI. I actually just changed from cool white which I've had for years and def like the look better. Man you'd be surprised how few GI that thing has

Never needed an OCD board personally for a non Capcom game. Personal pref, but will make it more original for sure

Kit too much. At least dont get the flashers

Cant imagine doing a PF swap without a rotisserie.

Depends on what kind of swap you're doing. If it's just a NOS PF you could probably do it like that. I've only done complete tear down every piece removed and cleaned. Also just did a repro swap which is totally more involved and complicated.

Buy standard flipper and sling coil sleeves, a lot of them as you'll be using them the rest of your life and they're cheap.
https://www.pinballlife.com/2-316-coil-sleeve.html
https://www.pinballlife.com/1-34-coil-sleeve.html

That will be the majority of them. Can't remember specifically, but I think there are some flanged sleeves as well.

Can you blue them instead of replacing?