Guru, I thought I had proposed an SSB spotting system that used RBN, here is the original text:
In case you don’t know John G4YSS often operates a club call sign G0OOO (in Scotland GS0OOO)
The idea being you tell a chaser to look out for spots on CW of an alternate callsign and to spot SSB when they see the RBN spot. By multiplying the CW call frequency by 10 in SSB spot, the chaser who is monitoring knows which SSB frequency to spot. The alternate callsign being the key for the chaser watching that you intend to call on SSB.
It’s contrived and requires someone to know what to do and to look out for the special spots, but it would fit in with where skimmers are listening.