Can you substitute coconut milk for coconut cream?

Your cooler situation seems pretty efficient. Not much else to add, besides maybe just pack it with as much ice as possible, and if it's at someone's house, keep it...

Use a ratio of 1 tablespoon (14.77 mL) of water to 3 tablespoons (42.52 grams) of coconut cream for 1 serving of coconut milk. If you'd like to make more...

You can, but it will change the taste and consistency of the final product.

Yes, you can.

Don't boil the milk. It should work for a few days if you're careful and preserve it. Store the milk and honey in the fridge.

Condensed milk would be your best option if you do not have whole milk.

Though mahamri are traditionally made with coconut milk, you can also use regular milk, though it gives the doughnuts a slightly different flavor.

Oats contain a form of gluten called avenin. Avenin can make the milk go "sticky" or thicken. Just change your ratio and add more liquids.

Yes, but it may alter the flavor a little bit.

You can make it with just milk, instead of cream. You will get the best results with whole milk, though some people have success with 2%. Don't use skim.