When it comes to 8.33kHz, the other regulator you need to throw into the melting pot, in addition to EASA, Eurocontrol and the CAA, is Ofcom.
Their risible 'Administered Incentive Pricing' proposal aims to force the aeronautical sector to switch to 8.33 by making 25-spaced frequencies prohibitively expensive for ground stations.
See
here
The squeeze is inexorable, in my opinion. 8.33 is on its way and unless you are planning on hanging-up your flying boots in the next five years I think it could be a false economy opting for a cheaper 25kHz radio.
Regards, jez