I'm looking for advice on connecting the water supply to a freestanding tub faucet. The risers terminate in 1/2" NPS (male) under the floor. Standard flex connectors are the obvious option but I'm not sure it's a good idea fully enclosing this type of hose under the floor. A secondary concern is that the restriction introduced by these hoses will impact the fill time. Tell me if I'm unduly concerned but is there a better, more robust, permanent way to transition from 1/2" copper to 1/2" NPS.