I have V555M also and installed an overflow collection bottle years ago. Do the same and you won't lose the coolant at all. Get a Gates #31348 (NAPA also uses the same number for their cap version) coolant recovery cap which is 7# and you will be all set.
Even after a cooldown it would be reasonable, if you keep adding makeup as Forklifft suggested, it will keep burping it out or once the engine is shutdown locallized hot spots may develop forcing some out.