Does MBAC and MBAA run on the same game engine? If so a PC port (or any port for that matter) of MBAA would not be much more that an update to MBAC.
On a side note I see Arcana Heart 2 is already being ported to the PS2. I guess a PS2 port of MBAA is not far away. Need to make your money when a game is hot and people want it, right.