Didn't know Final is selling ZE8k outside of Japan, they told me it won't happen until next month. I had their ZE8k for a few weeks, and indeed, while up close they look a bit odd, surprisingly, they are very comfortable and sit very secure in my ears.
The eartips are custom, and I already told them they should have thought of an adapter to use with regular eartips. I will try later to mod the smallest size eartips pair I don't use, cut the cap off to see if I can attach regular eartips over the stem/nozzle. Also, these do have Noise Canceling mode (not bad actually), Ambient Mode (so you can hear surrounding to raise awareness around you), Wind-cut (wind noise reduction mode, very effective when running/walking), and Voice-Through (puts music at lower level in the background while you can hear everything around you).
I'm a bit surprised you mentioned they don't have enough bass, did you try different eartips sizes? But you also mentioned in comparison to other TWS pairs, so perhaps it's a relative thing. After 100hrs+ of burn-in since I have been using them daily, I actually had to go into the custom EQ of their app to drop the bass around 60Hz and boost mids and treble. This is still tuned like their E-series iems, to have natural, organic, warmer tonality, not to be mistaken with A8000 which is vivid, revealing, micro-detailed. ZE8000 does have a natural smooth tonality, but also very good retrieval of details, and like you mentioned already, wide soundstage. To my ears, by default without applying EQ, the bass is a bit too commercially tuned with low end being a bit too thick for my taste. Using their in-app EQ doesn't shelf the bass, just reduces the weight, gives it more control and articulation, and helps to keep lower mids closer to neutral.
It doesn't support LDAC because, according to Final, they do their own sound processing with built-in DSP and don't see the need for it. The only negative I found so far is not being able to customize controls, those are hardcoded and you can't re-assign single/double/triple taps.