I have the 50% of the code but I cannot continue today.
I'll conclude it during my breaks the next week.

An example of the interface is

  csound -+rtmidi=alsaseq -M14,16 -Q128,129

Read from the clients 14, 16 and write to the clients 128 and 129.

The default for the client name is "Csound" but it is setable with

  -+alsaseq_client=[client_name]

that it is coherent with

  -+jack_client=[client_name]

tito