I can't speak to whether or not the extract will stick to things like that. I used a small throw away fermenter and bottled. I really enjoyed the final product and I'll be brewing more, for sure.
I made a cinnamon maple "porter" a couple of years ago and great success with maple extract. I originally used maple syrup and found it's just too fermentable to add any real flavor, even as a bottle conditioner. I used 1 oz in 2 gallons of hot wort, just before chilling, and it came out...