It would simply shut the MPT operations down. Re-skilling and having a approach procedure to the pilot boarding at some ports would be to expensive , they would simply revert back to pilot launches
Not necessarily the case. The MPT op in Karratha has evolved from NVFR single pilot B206 ops to multi crew, multi engine IFR procedures, timing the descent to the vessel as it arrives at the missed approach point of a purpose designed RNAV.
The old adage is true that if you think safety is expensive, try having an accident.