Dragonlight
The dispensation is to revert to the rule as it was under JAA (EASA screwed it up by saying that the full IR(A)course had to be completed). JAA allowed a conversion course of 10 hours.
I understand that the EASA rule will be changed to reflect the dispensation.
There is no need to do anything special to 'invoke the dispensation'. The dispensation allows a 10 hour course. That is what we have in our Training Manual and that is what we would provide.