Anyone still make a normal 29 bike ?
Not long and low. Or with choppered out forks.
Just normal. Double or triple set up. 100mm or rigid forks.
Like the first solaris would be good.

Vitus Nucleus and Sonder Frontier/Dial, Salsa Rangefinder probably fit that category... but double/triple chainsets?

I saw that Sam Allison was bringing back an updated Singular Swift but at significantly more than I originally paid

Designed around a 120mm fork https://ritcheylogic.com/bike/frames/ultra-frameset

My Trek Procaliber has a blanking plate on the seat tube, I’m naively assuming that’s for a derailleur as some of them came with doubles

Sanderson Town Crier?
https://clee-cycles.co.uk/P46003/product
I had a 'Life' 26" years ago and only gave up on it due to wheel size.

There's a Mk4 Singular Swift on FB marketplace:
"XL mk4 Singular Swift
Shimano SLX 1x11 groupset
Hope Hoop wheelset
Ritchey components
Fabric Scoop saddle
Conti X-King tyres
Collection only
Tyre clearance for 29x2.4 tyres"

Looks nice. £750

If feeling flush - Shand Bahookie https://www.shandcycles.com/shop/bikes/bahookie/

Kona Unit, brother cycles big bro...longer than 29ers BITD, but pretty normal. Though low stack of unit might not be ideal for you...