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I looked at this when you first posted, and considered you were looking at a field flattener, not a reducer, is this correct?
If so, and assuming you have both pieces, try the MPCC. OK, as some suggest it is designed for a faster instrument, it "could" work, so try it. I know this from personal experience, having used mine for removing the coma on an 80mm refractor, where others said it won't work.
I alkso have an AP 67CCD Telecompressor, which if I had known about a week or two ago could have let you try, as it was on holiday in Ozzie, but has since returned.
Bear in mind the flattener or MPCC will require a specific distance from the chip, and the OAG will be part of this distance perhaps. I looked at trying an OAG a while back, but gave up, it was just too hard. I cannot see what a decent low mounted guide-scope will be any worse than the OAG, and in fact prefer this to a side by side. YMMV.
Gary
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