Captain and Triadic - yes multicom 126.7 below 3000 would definitely work for me. Maybe combined with mandatory taxiing and inbound (in the vicinity of) calls only at airfields marked on charts or in ERSA and an education programme to counter the many unnecessary and superfluous calls now.
Still leaves it open for anyone who requires ATS to communicate on the suitable ATC frequency as needed.
All the above would keep the heavy metal reasonably happy also ��.