My take on NPMR perspective would be:
There are no photons.
There are no particles or waves.
It is just rules, data, math.
Simple rules, actually.
It's not as if someone made the rules up - and slipped.
Tom describes it as: they evolved.
But that can probably not really be proven, since it is outside of our reality frame.
It can be derived with some level of certainty from what we can observe, though.
That is why the math describes it flawlessly but it does not make sense to us, because we insist on all of it being somehow materially real.
It is real.
Just not material.
See also here.
While info on whitch path is theoretically available, you could observe particle-like behaviour.
However, the info on your "IN" could only be derived statistically, from more than one "photon".
After several "facts" at the detectors.
At that time you don't have info on which path for each single photon anymore - in your setup.
The result would be observing interference.
Same as with detectors off. They are not useful in your setup.
I suggest reading the article (mentioned above) on the delayed choice quantum eraser
It is the original experiment, annotated by the guy in terms comprehensible to non-physicists.
As to the "what the bleep" part and other nudges:
there is the work of PEAR