John, your hair splitting is pointless.
The application is for someone to enter the UK as the spouse of an EEA citizen...this is not what it is technically called, but it amounts to the same thing.
And the applications are not 'entirely different' - they require a different (on-line) form, there is no cost, but they are assessed the same and require the same documentation (even though this may be a breach of EU law, it is how the UK work right now).
And, as the UK break EU law quite happily by demanding that there is a maintenence test, how are we to know whether or not they would break EU law by demanding a minimum age of 21? Metock has been largely ignored by ECo's, remember?
My advice remains the same.
Vicky