Sub Phatty presets on Sub 37 via sysex import doesn’t seem to work at this point (0.9.37). Is this planned?
Not sure I understand. Are you trying to send Sub Phatty presets to the Sub 37 ? it should not work basically.
No this is not currently planned, although theoretically we could come up with a translation that would work. It would require a translation as the presets are not natively compatible with one another.
I’ll add it as a future feature request… 
May I enhance this idea and make it a general Phatty2Sub37 import… E.g. From a slim phatty, for which the sub37 should also nearly cover all its functions