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It seems you're limited to providing different pollers for every overlapped subnet, or NAT-ing everything so you can poll them from one poller.
Lots of folks have run into your challenge; you may find some enlightenment from their experiences:
Re: Overlapping IP Space --this is an old post, and it confirms you'll need multiple pollers, but at least it has a solution
Re: Overlapping IP Space -- The use of secondary loopback addresses is also an interesting concept
The headache of managing overlapping IP address space... A bigger discussion of the topic.
This topic is also covered in the SCP exam . . .