Sorry for being blunt, but this is a terrible idea. Why would you swap something stable, for something unstable? (please no flywheel BS)
You are stating that the DAO will step in to buy DEC when it is at 95% of PEG so it does not go lower, does the DAO have unlimited funds in order to buy up every sell pressure there will be?
The DAO should be diversified when it comes to it's holdings.