Probably, but when Alaska did a no notice Emirates award devaluation a few years ago they put out a statement that, "All changes made online will be ticketed at the new award level. Members who have existing award reservations can contact our Customer Care team for a one-time award change without spending more miles." This was a different situation so don't expect it to apply here. My takeaway is that there is no chance of an online change keeping the same price. There is a small chance you could convince an agent to do it. Don't hold your breath though.