I would consider using fuel hose instead.

The radiator overflow stuff doesn't have much internal reinforcement, it's just soft tubing. It will hold for a while, but I'm pretty sure 5 minutes after you start the car you'll be able to see it swollen up under pressure...then it's a time bomb for your coolant.

Fuel hose, radiator hose and other pressure hoses have reinforcement (threads or wires) which allow it to stay together under pressure. I think ordinary fuel line is 10-15psi rated but the EFI stuff is good for 60+ psi and will last as long as the car for only a couple bucks more.

Buy it by the foot from the bulk roll in back of your big local parts supply, rather than the short precut chunks that are way overpriced at the "discount" auto chains.