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> Vitamin K2 is a must, because without it all the extra calcium will be just hanging in your blood and that's not good.

What happens?

i've read that if you don't take enough calcium then to maintain blood level vit D causes calcium to be taken from bones. however, no clue about numbers. I drink two glasses of milk and get way more calcium than i need, is 4000 IU vitamin D high enough to warrant k2? what about body weight/composition, gender and my diet.

Nutrition science is in middle ages for sure

Well, for one it will deposit in the walls of your arteries.

Is k2 equally important if you don’t take d but get a lot of natural sun exposure?

Is it ok to take d in the morning and k2 in the afternoon?

My guess would be that it's OK.

Vitamin D should definitely be taken in the morning, as it affects circadian clock, but K2 timing is probably not that important.