Erm, where does the integrity(?) come in? You requested a procedure change without using the documented process and they said no. It's like suing Vicroads because they won't register your Lamborghini (or whatever richboy toy you turned up in) because you'd rather write your application on a live aardvark than the required form.
On the other hand, if we are talking about joining on the base leg if it seems safe to do so - I'm all for it
CASA inefficiency? Well that'd run.