I wouldn't. I would follow the recipe as stated and then use RO water to top off and get yoru gavity to the reading it should be.
"Sometimes when I reflect back on all the beer I drink I feel ashamed. Then I look into the glass and think about the workers in the brewery and all of their hopes and dreams. If I didn't drink this beer, they might be out of work and their dreams would be shattered. Then I say to myself, it is better that I drink this beer and let their dreams come true than be selfish and worry about my liver." --Jack Handey