I know this is old but stumbled upon this earlier which appears to be like a gergoplex with a trackpoint as an option:  

https://holykeebs.com/products/span

here’s the github: https://github.com/idank/spankbd

Not sure if you’re up to go get the PCB printed yourself and interested in similar options:

This one has longer vertical thumb keys: https://github.com/erkannt/neuro36

Really far away thumbs: https://github.com/sboysel/giraffe36

One that seemed to have the thumbs farther was draculad, farther than microdox:  

https://github.com/MangoIV/dracuLad/

Seen a few places selling kits.

https://www.littlekeyboards.com/products/draculad-pcb-kit

https://customkbd.com/products/draculad-pcb

https://keycapsss.com/keyboard-parts/pcbs/166/draculad-split-keyboard-pcb

https://keebd.com/en-us/products/draculad-keyboard-kit

There are a fair amount of handwired ones, prototypes, higher key count boards or 2 key thumbs as options for farther away thumb clusters as well. You could also try to get more than 3 thumb keys and not use the ones too close to your thumb.

Might be worth looking through if you haven’t already:

https://mechdb.net/keyboards?split=true

https://golem.hu/boards/

Honestly could swear I had seen more, but when I checked 3w6, waterfowl, or several others it was just really long thumb clusters. Not actually lower down on the board away from the alphas sadly.

Hi, please see the rules around BST. I’m aware though that the alternative listed is still /r/mechmarket on reddit which you may not wish to use. I would suggest asking in relevant community discords like the low-profile keyboards discord or regional ones for where you live as many of these have trading channels.