I buy 15 ft remnant hoses at Big R and put a shut off valve on them on the end that doesn't have the sprinkler, then attach my supply hose to that. Turn on the water at the faucet with the valve on the hose turned off, and you can adjust the sprinkler from a safe distance.
Don't know if that would work with those flexible hoses because I don't have one yet. But I mean to get one soon!