Kind of split between either a more expensive frame or less but below are the ones I am considering.
Sklar Super Something, Singular Peregrine, Crust Bombora or Evasion, Elephant National Forrest Explorer, New Albion Drake and Privateer, Brother Cycles Mr Wooden, Stooge Rambler, Black Mountain Mod Zero or Monstercross.
Most are dual 650b/700c*. Some are designed around 650b. Monster cross and Privateer* are only ones 700c only. Tbf I have no idea what the big brands are doing since I am only looking at steel frames and most of consumption of bike media is Radavist and Bikepacking.com
At this point there are hundreds of gravel bikes available, the vast majority are 700c. Most of those you listed are small run options available only as a frameset or custom/parts build from a shop. The Elephant NFE is a mid-tech low-trail frameset that isn't available for purchase again until sometime in 2025, if ever. The NFE was offered as a stock frameset in 2014 building on custom works done earlier. I don't think it's applicable to the argument I'm making.
Ted King winning DK200 in 2016 did not ignite a major change in the industry of enthusiast base around 650b. They tried, it failed, 650b was and remains a niche wheelsize. It's had the same steady low-level growth as it did before his win. There was a bump in available bikes 2017-2019 but it didn't last. The point is, winning isn't enough to change the direction of gravel bikes. WTB Road Plus has mostly declined into nothing, the 650b Google Group is almost entirely classified and discussion tertiary to the wheelsize, Jan is mostly on 26" wheels these days, time has moved on from 650b.
*Every disc brake bicycle is dual 650b/700c, and if you can handle another 12.5mm of bottom bracket drop, every disc bike will also take 26" wheels. The Privateer is 650b in the smaller sizes.