Small point to note whether doing "the soft-shoe shuffle", "one man band", "single pilot IFR" or any combination/extrapolation thereoff
:
On any aircraft which has to have the FD fed with info in order to present sensible demands when flying with autopilot disconnected, the non-handling (at the time) pilot has the additional workload of data and mode selection in addition to RT.
This applies whether using the BA or any other system and may not be the safest way to operate the a/c in a busy terminal area.