Not a problem! I do this type of thing routinely by cutting off the water heater and toilet (the toilet is really the biggest problem to drain if you don't have an air compressor to blow out the system--the water heater is a problem because to drain it is to waste 6 gallons of water). See my valves in
Note my last post--the problem with backflow in the sink fixture. Make sure this doesn't happen in yours or you'll have water in the hot side pipes. You'll also get water on the hot side if you're not really really careful when you use the faucet (if it's a single handle type). Any crack towards warm and you've opened the hot side valve, allowing cold water to flow through the fixture into the hot pipes.
I think it's a better idea to just count on draining both sides or isolating the hot to the kitchen, just as you plan to do the cold. My Overlander and Caravel
have copper, so I have a drain (hot and cold) under the kitchen and two (hold and cold) near the bath, so no matter if I have a little slope where I'm parked, I can drain everything.
One nice thing about isolating the kitchen is that those lines are all visible, not under the shower or behind the bed or some other place where you're not sure what the temperature is.