Have owned the ER4SR prior and it was excellent. Also owned the Blessing 2, which in some ways is better, but I don't think the Blessing 2 is worth its high-price. That said, I let me ER4SR go at the time when I had the B2. Ended up losing the B2, and instead of buying another one, decided getting one of the new low-cost planars.
Picked up the Shuoer S12. Oh my. The performance on those planar drivers is incredible. It is clearer than both the Ety and Moondrop and not just due to its tuning. With a good seal, that planar bass is so transparent. I think overall I prefer these to my old LCD2 revision B! Much much cheaper as well. The tuning is more v-shaped so is more exciting than the Etys and Blessing 2. I use mine with spatial audio which helps diffuse some of that intensity.
You may want to look into the Moondrop Stellaris which looks to have Etymotic like deep fit. Also the 7Hz Dioko which has a more Ety like tuning. 7Hz Timeless and other planars in this class. The S12 Pro is out now as well, but is mostly the same, but may be a bit less intense.
I just bought a ER2XR for cheap, and excited to hear it. Missed the isolation as well, which is a big reason I decided to pick it up in addition to its signature.
Also, a shout out to the diminutive and inexpensive Moondrop SSR. That is quite a performer, and in some ways has a presentation similar to the OG of IEMS - the ER4B. Which was designed for binaural use. The SSR I actually preferred over the Blessing 2 in many ways, and even the SSR low-end was more controlled to my ears and I liked its presentation more. Pretty cheap, with a comfy low-profile fit and removable cables. Mine went through the wash and haven't yet replaced it. I'd also be interested to hear the Moondrop Quarks DSP. That little driver is actually very effective, and they are so small you can listen in bed with these easily.
Edit: also look out for the Truthear Hexa, looks like Moondrop Blessing 2 on the cheap yet still with good quality.