Possibly you'll have to re-tailor your expectations. Such a topic as yours has never been discussed here, and as you see no-one's jumping out of the bushes with expert advice, meaning you know more about your 'area' than anyone, are the expert.
But, what Pianoteq does have to say about MIDI is covered - briskly - on pages 24, 25 of the current Manual, where Sysex isn't mentioned, while you're directed to the Options>MIDI page of the Standalone version for more sophisticated options (and where again the discussion's brisk).
However, if you change the Current MIDI Mapping from Minimalistic to Full Featured, and run the slider fully-down, there you'll find a clutch of MMC settings. Whether these can be modified to what'd suit your purposes, then saved, or others added then saved, isn't known to me.
Meantime, Bank Select for Pianoteq's purposes seems to be set directly from the GUInterface. Possibly some Control Change message(s) can affect it, but your fingers certainly can. Next to the Preset Selector of the main GUI, spot the 1st icon rightward (a pen) and leftclick to get up the Preset Management window, which can be slid around and at right of which are the management controls. A little playing around will show how they work.
