Dynamically change model managers after initial queryset instanciation

[Jason]

Let's say I have a Poll object with two managers attached like so:

class Poll(models.Model):
   #fields here
   
   objects = PollManager()
   subjects = SubjectManager()

is it possible to dynamically change which manager is used to make which query after the initial call?  For example

results = Poll.objects.all()
results.filter(some_field=some_value) # execute filter on queryset using default Poll manager
results.changeManager(subjects) # change queryset's manager to different Poll manager
district_results = results.aggregate_district(district = some_district) # execute method in alternative Poll manager

There's nothing in the documentation to suggest this has been considered, nor in the codebase.