I think one of the trickiest things about this transition is working out what works for your child - as they are all so different, and this transition is no exception. Mine is a champion nap-refuser and does not tack on easily at all, so I have to do EBT and cross fingers. He's only JUST now doing some decent length sleeps, but as you can see, we have lots of 11hr nights and EW too. Some kids will happily nap when they really need to, and will tack on too.
In my experience, it's been really hard to get any consistency. I have kept offering a nap all along, and accepting quiet/rest time if it's a NND. My kid will also nap late and still go to bed at a reasonable time (at the moment) so especially earlier in this process, if he didn't nap but really needed to, I would do a later afternoon emergency car nap - just be sure to cap it! :-) We eventually fell into a pattern of 1 nap day/1 NND which was great for a while, then he extended it out to 1 nap day/2 NND's etc. I pretty much have always given him the opportunity for a nap since we started and he has napped sometimes when it surprised me, and other times not when I really wished he would!!!
Not saying my experience will be yours of course. It's really a hard phase, has made life quite stressful for me over this period of adjustment. I am finally seeing some light at the end of the tunnel, but we still get OT days and I just try and have some quiet, low-key days at home if needed, especially in the afternoon, and try get some fresh air and activity outside in the morning.
We will get there, sooner or later. :-)