Athelnick,
In my view, yes, an updated Rotodyne would still need tip jets, because that gave it the very low weight, zero torque rotor propulsion system it needed. No gearboxes, no transmission shafts - just hot gas ducts from the two turboprops in the wings.
That said, Fairey had big problems with the stainless steel ducts, which had to double as rotor blade spars. The other big issue was noise from the tip jets - but they were a long way down the track of a silencer design.
I actually watched the aircraft land at Battersea Heliport - and it was VERY loud.
Best Regards as ever
Engines