Curious to know if you have any thoughts about the Eucalyn layout. It's a layout focused on Japanese, Vim, and Dvorak: https://eucalyn.hatenadiary.jp/entry/about-eucalyn-layout
Shameless plug, this is my Dvorak/Vim focused layout Small Board for Dvorak (SB4DV): https://github.com/1MachineElf/qmk_firmware/tree/_sb4dv/keyb...