Pay and offer as much as you may want, BUT I am willing to bet that 99% of those day shifters wouldn't even nibble at the opportunity to go back to evenings, overnights or weekends. THINK how long it took many of them to get to where they are now. Why would they give it up to take a shift that it constantly understaffed, overworked and underappreciated.
On day shift, they are driving the two seat convertible on their way to retirement; why would they want to go back to driving the 1979 station wagon on the off shifts? I would give up all my (measly) shift differentials, sign-on bonuses and any other incentives to have waking work hours back again.
Many of the facilities around here hardly make it worth it to even walk in the door to work evenings or nights. Management claims it is because it is "What the market supports in this area.", which may be true. I am talking anywhere from $0.50 (yeah!) to around $1.75 extra per hour for off shifts. With these pennies, tell me again, why anybody would gratiously give up their cushy seat on days to go to overnights for the rest of eternity?