If you want to make a low content wine, it may be better to just start with a low OG and follow the normal process.
If you want a sweet, low content wine, take some SG readings over the first few days. When it is getting close to your desired content, cold crash, rack and stabilize. You'll be fighting to stabilize it with so much food for the yeast left over I'm sure, but a few rackings and stabilizing could do it. Of course the benefit to this is you can get the final product more clear to avoid the yeast flavor that I have usually found unpallatable.