Thanks FCB, looking forward to giving that a listen when I get a chance.
Could work, anything is possible, but it's too far back for Blumlein IME&O. If feeling compelled to do something similar to that, consider running X/Y hypers with a bit more angle (say 110 degrees) instead of X/Y 8s at 90 degrees, which will provide a similar coincident phase-free stereo feel to Blumlein, with considerably more openness and ambient width than X/Y cardioids, but with a bit room reverberance and a more forward bias. Those are two things I'm pretty sure you are going to want recording from that position.
Sure, PAS is a rather conservative taper technique as traditionally done, but the spacings suggested by the improved PAS table are pretty damn radical compared to how it is usually done. If I'm off on assessing the angle between PA stacks as seen from the recording position indicated in the photo, and in actuality the angle is smaller than 60 degrees (which is entirely likely), these become the suggested spacings:
50 degrees between stacks, suggested spacing of 33"!
40 degrees between stacks, suggested spacing of 46"!!
And for most tapers, that's a more radical experiment than Blumlein!
[edit- remember that the width of a fist held at arms length, squinted at using one eye, covers about 10 degrees of arc, so 6 adjacent fists = 60 degrees approximately]
[second edit- a simplified explanation of the reasoning behind improved PAS table is this: the rapidly increasing spacing between mics as the angle between them grows narrower and narrower is what counters the tendency of PAS to be overly mono-phonic and narrow sounding, while still retaining the direct clarity of pointing the mics directly at the stacks. Blumlein is excellent at enveloping and wide-sounding stereo, but has no forward preference or "reach" at all. It is sensitive to pickup of sound arriving from all horizontal directions equally.]