From memory the PFA were very negative on the use of ground adjectable props on direct drive engines. There are a few approvals for Warp Drive props on Continentals (I'm applying for one shortly to boost the number a bit!).
However from memory there are not any Ivoprops over 65hp on geared engines. The approvals list will cocver the UK experience, getting anything the LAA will believe from elsewhere - best of luck. Possibly Australia as they ahve a not dissimilar approval process but anywhere else is unlikely to cut much ice.