je.f
Just for unanimity's sake, we (Maastricht) will always appreciate 7700 ASAP under those circumstances. There's no faster way of getting the controller's attention, the correlation is maintained (ie. we still have your data block, CS, FL etc.), your track symbol is forced for display regardless of layer settings in all sectors and our colleagues in Amsterdam, Bremen, Langen etc. have a visual as well. Cuts down on the time required for the required co-ordination.
All in all an excellent idea. So, je.f. keep doing it like you've always done it!