Well this really should just work, you can connect to standalone using either the existing ODA or a direct SQL DSN connecting to the LOCAL MSDE database.. Exactly what are the problems you’re having from Crystal ?
If using a direct MSDE DSN, then ensure you do a test connection in the DSN set-up first to eliminate any user id & password issues.
If using the ODA, make sure that the ODA is set up properly before trying with Crystal.
-Alternatively, the Unity ODBC driver is gratis for standalone use, check it out.