Thanks for the elaboration @Illusory, I can definitely hear the pain points more clearly now.
Just so I understand, it sounds like your need is focussed on ‘pulling’ into Fibery (like a one-way sync/mirror) including Fibery schema updates to reflect source schema changes.
Did you imagine needing to push data (and schema changes) from Fibery as well? Or is it mostly about having ‘external’ data viewable and connectable from within Fibery?
Did you at all follow the discussion here:
Is your need conceptually related to this sort of thing?
As Michael indicated in that discussion, opening up an ‘integration SDK’ is not impossible, but might not be widely used.
BTW, do you have specific external data sources that you consider v important? Perhaps an integration you desperately need is on the horizon… 