The problem is this is a niche design. It can’t be completely found because there is not enough of a market for this style. It is still a valid design, but at what price would someone spend to get it.
Will someone spend $1000, $2000, or more for specific design and components that together are fairly unique today?
The major manufacturers can get 90% there for probably a fraction of the cost due to their purchasing power. They have networks of shops and some warranty assurance, although somewhat limited.
I think the biggest issue is if you line up 50 people to give his/her ultimate bike, you’ll get 50 different responses, even if it is a type of valve, or no tube at all.
John