it's not difficult but it is tedious since his converter doesn't perform batch conversions. And the BVE 5 suite seems to still be a work in progress, the converter is still in it's beta stage, so hopefully he will address the problem and add b3d support.
This should also be a push for us to start coding in newer formats. Sure to some rw may be easy to code in and that's cool, but b3d objects and csv objects share mostly the same code, just slightly different commands. It's about time we ditched the .b3d format