Capt,
I think the AIP makes it 'fuzzy' when it talks about the IFR call WRT making it to ATC or as part of the taxi call. The GEN 3.4-49 calls 'for a departure at non controlled aerdorome' could easily be read as calls to the aerodrome traffic, rather than to ATS.
It would be great if 'they' would make it a lot clearer for us anally retentive types
