The Wessex was a development of the S58, I don't see how that design could have been further developed, except for the vee frame landing gear that Sikorsky brought out to reduce the ground resonance that the machine was prone to.
It was also the worlds greatest vacuum cleaner, many a chief engineer received a roasting for engine stone damage, (engineers were always blamed by logistics for engine damage).
There was an attempt to reduce the damage by fitting air intake filters manufactured by Aviation traders, but they weighed a ton, and damaged the hinges and attachments.
There will always be a soft spot for the Wessex however.