Don't mention VMC on top.
VMC on top is something that every JAR-PPL holder (except UK) can do. EASA harmonisation will dispense with the UK restriction in this regard and thus VMC on top has nothing to do with instrument flying it is simple VFR flying.
Having an IMC rating means having the legal ability to complete IFR IMC flights and every thing about it must concentrate on the privileges of the rating - IFR IMC flight.
The fact that IMC rating holders like the IR holders prefer to cruise in the sunshine has nothing to do with the rating. Any IFR flight must be operated on the basis that from entering IMC it may not exit IMC until reaching minima at the alternate.
I would caution gathering too many statistics that will be used as a good example of why the IMC rating can not be continued with. Do you really want to prove that the majority of holders do not use the rating or that those that do are not current in the strict meaning of current?
Gathering data can help and at the same time hinder your objectives.
Regards,
DFC