Thanks yablacky!
That works things out fine for my usage case.

I understand it's impossible to silence (only) the first SMS, can though live with that;
Anybody with a suggestion to delete (only valid!) received SMS by Software or a script after reception by smscon?
i.e. "delete anything which starts with COM_PREFIX" from sms-inbox

Michael

P.S.: Again: great tool, I love it though since now I used it only for the non-existant case of loosing it, it can do much more for me now