Note the ODBC branch is not currently buildable except via CMake in Windows, in a rather ad-hoc way.
What has to happen is coordination with @szeng on how the evolving extension model will let you selectively build each extension or not, and either as a dynamic library or as part of the executable. It's published so that he can look at it. But I've given an executable to @gchiu to try just to see if the %odbc-test.reb works, and to suggest any table definitions or data types to challenge it which are important to have working.