With a growing number of apps adding "Save as DAISY" options, I'd focus first on getting BrailleBlaster to work with DAISY files. If BrailleBlaster provides unique features that users need and can't easily obtain elsewhere then that should motivate them to find some method to convert any non-DAISY files to DAISY so they can use BrailleBlaster.
Another important consideration is that the next-generation DAISY XML format known as ZedAI has already been developed and is currently under review. So this is not a good time to be investing a lot of resources in the old DAISY format.
You can read more here: http://www.daisy.org/zw/ZedAI_UserDocumentationSusanJ
