In my opinion there is nothing wrong in you deposing evidence as DW 1 and also rope in other witnesses from your side to support your plea and enable to get out of the case by an acquittal. A little care and home work will take you out of the fear or hype created by others in this connection.
In fact this will give you chance to bring out the true color or actual face of the defacto complainant while you express the truth behind her false complaint in the form of your own evidence.