Well, now you've learned not to waste your time with brews that will naturally finish at a gravity that makes them taste like cough syrup. 1.141 is just silly without special fermentation techniques. If you want to brew a beer with any type of drinkability you have to draw the line at about 1.110, unless you want to add a high percentage of simple sugar (which, again, you can argue will affect drinkability).
Consider it a learning experience.
If it was me and I REALLY wanted to fix it, I'd brew up a similar batch at a much lower gravity (maybe like 1.080) with about 20% simple sugar, ferment it out then blend the two batches together.
If you're in a big hurry, buy a 1/6BBL of a really dry IPA or APA (maybe SNPA?) and blend with the commercial brew.
IMO champagne yeast won't get you where you want.