I know i've seen them but it might be easierjust to go with a layout like one of these.. I'm not suggesting this particular company, i have no experience.. but just easy to find photos:

https://www.keychron.com/products/keychron-q1-pro-qmk-via-wi...

This layout seems cool though I'm pretty sure you could find one w/o the f-frow.

I've gone with a 65 for my only 'flat' board. https://www.keychron.com/products/keychron-k2-pro-qmk-via-wi...

You might be able to find one with the hhkb 'missing molars'..

HHKB/Realforce did make a hhkb lite with inverted-t arrows in 2001... you can see it on this page: https://hhkeyboard.us/about/history

The ANSI HHKB does not have the arrows, but if you're willing to use the JIS HHKB, it actually comes with dedicated arrow keys, and even a split spacebar with extra thumb keys that you can reprogram with software to act however you want.

I’m pretty happy with just plain HHKB, just wish I could have that layout on a laptop. Maybe one of these days some company will produce aftermarket HHKB layout keyboard components for Framework laptops…

I'm super happy with it. So much so that I have two. However, occasionally I do want to "play pacman with one hand and eat pizza with other". Impossible to do with HHKB.