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Even deferring feedback by a couple of years would make a difference - and as institutions that can afford long-term investments (my university, for instance, licenses some of its buildings to government on century leases,) it doesn't seem like there's any huge hurry.

Or perhaps restructuring their courses so that there's more practical work - perhaps working closely with companies in the area with internship schemes - to allow for more accurate in course feedback.

Or getting feedback from other teachers in the domain - that would be imperfect but I suspect might still be better than asking the students, assuming that the teachers were generally trustworthy folks.

Or doing, optional, follow up quizzes on the material taught... six months down the line and paying the students £20 each to do so - that would at least help to assess retained material (though not the worth of that material itself I suppose.)