You are absolutely on the money here. This is going to require a 75 percent vote in favour anyway so you have a lot of wriggle room in terms of nudging people towards doing the right thing.
I would be suggesting that the EC spends some money investigating the options and then comes up with a couple of alternatives, one of which will eventually be locked in as the preferred option through a vote at a General Meeting.
By the way, it’s vitally important that these changes are only approved on the basis that the individual owners have to repair and maintain them. One of the biggest costs in new apartments fitted with these increasingly popular sliding external metal blinds is maintaining the things as they don’t last too long before they get broken, bent, jammed or fall off their rails.