Originally Posted by
Deckard
I recall a colleague in the mid Eighties who used to claim that he booked two tickets, one refundable in First, one in Coach. He'd print off both sets of boarding passes, check in using the coach ticket and board using the First BP. Upon return he'd refund the First ticket. He claimed to do this by omitting the space present in his surname pn one booking which led to his two personae being greatly spaced on the manifest.
I have no clue if he was just winding up a young and impressionable Deckard.
Seems hard to imagine that he'd be allowed to get on board using a BP that hadn't been "checked-in." And if so, harder still to imagine he'd be be permitted a refund for it after having used it to get on board!
For that matter, if indeed mid-eighties, I'm having a hard time figuring out how he'd ever get a boarding pass without checking in at the airport check-in counter first, as that's how things generally worked back then...
Back to the OP's situation, I unfortunately don't have a clue as to whether the WTP segment can be upgraded using Avios, but if not, I don't see why it wouldn't be possible to buy the CW ticket using Avios and cancel/no-show the final leg of a WTP booking. Frustrating, though...