Just throwing it out as a potentially reckless idea before I write anything else.

There are 5J redemption seats available MAN-ORD at 12:20, and an EI flight at 1000 that would get you to MAN at 1110 (£100).

You ought to have the option to refund because of the canx, but it may affect your return? Technically you shouldn't be able to book <24hrs but the website will probably do it. Have seen issues with delays in BA ticketing AA redemption though.