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However... I have 2 MyfocuserPro version 1, and they are identical in all respects. I can attach them as you say in Ekos, one as Focuser, and one as Aux. But I have no way of knowing which is which nor to make this consistent. All because the Raspberry cannot see any difference between them.
So what I did, was to use 2 raspberries: One focuser attached to each (and of course, Ekos running on both). Doing that, I can give the focuser on Raspberry 2 and alias (for instance Moonlite2) and then connect to it as a remote device from Raspberry 1, and then just do everything from Raspberry 1. I can explain in more detail if you wish.