Ubuntu :: Convert NRG Mixed-mode To BIN / CUE?

I've just spent the past two days trying to figure out how to convert an NRG image to BIN/CUE format. I've found all kinds of info on how to convert it to ISO. I've tried lots of different packages (K3B, Brasero, AcetoneISO...). No luck.

My NRG is an image of an old DOS game I want to play in DOSBox. The catch is that it's mixed-mode, so converting to ISO is not a possibility. DOSBox will mount BIN/CUEs, so that seems the route to go. But while K3B supports creating mixed-mode CDs, it doesn't read NRG images. And while AcetoneISO will mount the NRG, only the data track is accessible; the audio tracks aren't.