S-70B-2's are no longer supportable, even as utility aircraft. That's why there was such an unreasonable haste to replace them, resulting in the SH60R decision.
Is this airframe/engines/systems or avionics. There was a proposal from Sikorsky to take then back and refurb them. How could this be. Many other countries still fly the S-79-B.
It's a great idea to by 24 x R's however using the basic S-70B airframe engines etc a small fleet of utility cabs could be used. The same argument re old and unreliable was used when we replaced the Wessex with the Sea King in ASW etc. The old girls soldiered on quite well ;later. When I was on Melbourne we had two Wessex for Perdo and other duties always seemed to be 100% on the go.