Its been a while, so to be honest I don't know what the current UAS syllabus includes. I have been told it is less comprehensive than it once was. Honest question, what is required for either the LAPL or PPL that is not taught on a UAS. My recollection is that years ago the only item missing was the solo landaway, and since all of the syllabi have changed since then....
Ideal solution would be for the RAF to submit the UAS training manual to the CAA for approval. As you say thats unlikely to happen but realistically what is in the AFE/Pooleys books that a UAS does not cover these days?