Forum OpenACS Q&A: multi-db db_* API support for ODBC
Key bit for you: At that time, I added bind variable emulation to the ODBC AOLserver driver (based totally on the PostgreSQL db driver code), and then used it in multi-db. I think that driver was nsodbc, although there are/were several other AOLserver ODBC db drivers as well. The "ns_odbc_bind" failure you're seeing sounds like you're using a version of the driver which does not contain bind variable emulation. (I don't remember whether I ever contributed it to the SourceForge AOLserver CVS - quite likely not.)
Also, when I later ported the multi-db code to OpenACS, I was no longer using ODBC at all, and I have never used it since. (I set up PostgreSQL just so I could test against it, and tested against Oracle since I used it, but I don't think I tested with ODBC at all at that point.) AFAIK, no one else has ever used the multi-db code with ODBC either, it has only been used for real with Oracle and PostgreSQL.
So, given it's totally unused orphan status for the last five years, I'm not suprised that OpenACS multi-db support for ODBC is broken. So once you fix or work-around the "ns_odbc_bind" thing, you might encounter additional problems as well, but probably only small ones since the multi-db code has been stable for a long time.