I should think that any engraving would not extend staff lines between pieces, as on manuscript paper – even though you are reproducing the exact text.
I would use the coda feature to make a gap, since you need new clefs & meters anyway.
That may be so, but I want to reproduce quite closely the page Bach wrote, for just purely personal preference, not necessarily adhering to the rules of music engraving themselves engraved in stone. And in fact I need this capability quite a lot for the other aspect of the work I do in New Complexity School works, which is partly why I have asked, without wanting to muddy the question.