you can no longer get an ETC for canceling - only an FFC. The window to have a choice was pretty limited - sometime not long after the pandemic started (maybe April 2020) to maybe early fall 2020. There were definitely some reports of agents manually converting after that on request, but definitely not many recently…even on request mostly stopped in the early months of 2021, IIRC.

i wouldn’t say an ETC won’t be done for sure, but I’d give very low probablity, that it’s barely worth asking, but you can always give it a shot. The prime benefit of an ETC over FFC is the ability to use it for any traveler, vs. the same traveler required for FFC. If you know you are going to travel again by end of the year, it’s definitely not worth the hassle (IMO) of trying to get it changed.