Is there any simple way to glue a binary file and its detached pgp signature together into a single pgp file (as produced by non-detached signing) ?

Uhh, this would sort of defeat the purpose of a detached signature; in which case why not use the regular signature?? Alternatively, you could use MIME multiparts to encode the binary file (in one part) and the signature (in another part) in a single message. Is this what you want??? -derek