Its a little bit tricky, if my understanding is correct.
This port was built from (I think fairly heavily) adapting the existing Android port, so merging the iBasso source would nuke our existing Android builds (and/or add target specific code that doesn't have much business being part of the Android port).
What would need to happen is separating the two, and giving the iBasso its own build target.
Now, this isn't necessarily difficult, but nor is it trivial, and I'm not sure of anyone but the original port developer that actually has the hardware in question.
[Saint]