Are you saying that you have to switch back and forth between 8N1 and 7N1?
Short of writing your own serial routines, I don't see it happening with PBP.
A thought (if in fact it's not possible to switch between 7N1 and 8N1), how about putting a 'hijacking' PIC in between the receiving PIC and the sending device to receive 7N1 in software and send out 8N1 in hardware....a sort of buffering translator...I can see a 16F628A doing that rather easily.
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