Yes even a small nap makes a very big difference.
I would agree to try what you can (including later BT if needed so that you can get that CN in) before moving to the one nap routine. My concern with this nap drop transition is that I had a rough time with my DS through it and the memory lingers!! lol
Mine had a lovely totally independent 2hr nap every day without fail...right until he refused the second nap. I couldn't feed to sleep, AP involved an hour of quite energetic dancing with him and forcing him to sleep (it was exhausting) and then even that failed. As soon as we moved to one nap he stopped sleeping the 2hrs and woke every 20 mins OT
We got through it, obviously, but it was very hard.
So, yes, yes, yes, that little CN can really help you get through even if you can only manage to AP and make it happen for a few more weeks.