I use a variant that requires only 34 keys. It's amazing how many extra keys you can eliminate when when you dedicate a couple to each thumb. Without extraneous keys that require you to reach away from the home row, is very efficient to use. A mnemonic keyboard layout keeps it intuitive.

The Miryoku layout is a popular choice: https://github.com/manna-harbour/miryoku

As a Dvorak user, here's mine: https://github.com/1MachineElf/qmk_firmware/tree/_sb4dv/keyb...