Hi Donny,
I tend to think the newer the style, the more complex they're getting & the harder it's going to be to get a good conversion.
I do the occasional yammie conversion from a "Midifile of the Style". I tend to stick with the older styles, ie if I can get the same style in psr1500 vs Tyros, I'll do the psr1500 version, no mega voices etc to contend with.
Must be a nightmare for EMC to keep up with all the newer types of styles, Ketron & now Yammie include audio parts, Korg has Guitar Mode tracks ( which aren't just normal midi tracks).

The days of a simple tweak, may be gone in regards to the newer styles.