In a word...Yes! Take the resort monorail to the Ticket and Transportation center. Get off. Here you have to walk down the ramp...and back up another ramp to get on the Epcot monorail. Debark at Epcot and walk through FutureWorld to World Showcase at which point you'll bear right to Canada.
From the time you leave your room until you board the Epcot monorail will take you 1/2 hour tops (should probably take no more than 15 minutes)
The ride to Epcot takes 6 minutes
The walk to Le Cellier from when you step off the monorail takes 15-20 minutes if you step lively...a half hour if have time to take a leisurely stoll.
This gives you plenty of time to spend at least 15 minutes with your children after the babysitter arrives.
If you anticipate tears/anxiety (on the part of your children, not you, mom!) you might want to have a small present for each (flashing wand or flashing pin etc.) WRAPPED (wrapping is very important, makes it specia)l and they have to hold onto it all wrapped up until it is exactly seven minutes after you leave...1 minute for each of the seven dwarves lol... and then they can open it. Lol...I used to have so much fun doing things like this for my kids.
If you're leaving at 6:15 and your reservation is for 7:30, you should have time. 
