John,

Do you have a room with natural reverb there you could use? Garage, bathroom etc . . . You'll need a portable recorder too. Mic the room in approximation to the Flute.

Or,

Use a completely dead room and use an artificial reverb post edit, but you'll need a VERY dry signal on the Flute capture during recording.

Did you get those "Blue Cat Audio" plug ins PG pointed us too a loooooong time ago? They work very well with Biab. I use the Chorus one from them when I need to fatten up an electric piano or bass. I'm sure it will also fatten up the Flute as well. A little dab will do ya.

Trax