I don't think this approach would be feasible, B.

If I understand the process correctly, the melody parts you enter through the Notation Window in BIAB are actually stored as MIDI information in BIAB files, and the display of music on the screen is done by conversion of the MIDI data back into staff form. This means that BIAB can import MIDI files and play them back correctly, but that the subtleties of musical notation may be lost in the translation.