Force static subset question pool on failure in same attempt

I'm trying to set up a course where the users are all initally presented with a static pool of questions. Upon failure, I would like to present a secondary static set of questions (no randomization) within the same attempt, but am having trouble figuring out how/if I can make this happen.  It's not quite branching because I don't want to use a cumulative grade across both sets of questions. It's a hard line; if they fail static set 1 they get presented static set 2 and would need to pass all questions in the 2nd set.

My only other thought was to potentially put all of the questions in a single random pool of say, 20 questions. If they fail the first 10 randomised questions, those questions that were presented somehow get excluded, leaving the user with the only remaining 10 questions (which would appear like a totally new set).

We're using Captivate 8 with Moodle