The 1 hour flight (different approach).
If the one hour dual flight that is required for licence/rating revalidation can be replaced by any test or lesson (even in a different CLASS of aircraft) - does it HAVE to be done in a fixed wing??
Would one hour of helicopter training - or a rotary test - cover it??
If not - why not (by that I mean chapter and verse of the bit that says so in the book - not just your opinion)