Chris,

With Banggai it is possible to do that, depending on your set up, but the best thing to do would be to pull the male around 21-23 days before he releases the juveniles. Juvenile Banggai are pretty fragile and it's best to move them while the male is still holding them. Mine usually spits them out as soon as I net him and put him in the rearing tank. After that I just put him back and start feeding the juveniles.

As far as angels go, there has been some success with the dwarfs such as flame angels. Larval feeding is the key here as with so many species.