Reviving this thread since the possibility of going now is looking brighter.
I just called WDW and added $1632 CDN to my resort reservation using my gift cards. Well...that was a process!
The lady had to break each payment into smaller denominations. At first when she tried to process my full card ($980 CDN) it declined it even though she could see the balance. So we did $500, then $250, etc. Then we did the same for my other card ($660 CDN). Now each card has a small balance of $5.39 and $2.96. I can live with that.
I now have a balance of $314 US and hopefully there will be a discount (10%) on values for when we are there which would bring that down even more.
I also reconfirmed the Air Miles Canadian Rate FLEXIBLE date vouchers are not expired and we are good to go whenever we decide to visit.
Phew!