I just went away for 2 weeks myself and had this same issue. I found someone to keep EI dosing my tank, but I did slightly less dose. I reduced my lighting from 100% to 55% but left photoperiod the same. I left co2 running the same also. My thought based on others input was to keep things as close to normal as possible while I was gone. Any time you take away from routine you run risk of algae or dying plants.
I would think your plants would suffer the most in your idea above though, since they will be w/o ferts. Granted their needs would be less with less lighting and no co2, but they may not make it w/o the ferts.