Join Date: May 2007
Location: YYZ, but my heart is in Asia
Programs: AC-SE, CX-DM, DL-G, Hyatt-DM, Hilton-DM, Fairmont-Plt, Marriott-S, Accor-Plt, SPG-G, IHG-Plt
Posts: 4,396
I have done this once before. Downgraded from F to C, like your situation.
But this was back in 2005-6. I don't know if they have changed the rules or not.
I am no Aeroplan expert though.