I would like to replace a center tapped transformer, which is directly connected to a full bridge rectifier, by two DC lab power supplies.

Does that make sense at all?

The power connector goes directly to the rectifier, and I do not think the rectified sinus shape is needed or useful. 

Can I use the two power supplies to provide the DC power that is used behind the rectifiers originally?

(I want to temporarily power an stereo audio amplifier module (TDA8954).
It does not need to be efficient, not even save.)