Can't say I agree with the sentiment. Miryoku's layout looks pretty arbitrary, as is any other <60% setup. I daily drive a Planck (4 more total keys, but very similar levels of layout restrictions) and my layer designs are wildly different.

I would say just find or build a keyboard with support for Via or Vial so that you can change things on the fly when it feels wrong. If you're going down the small form factor keyboard path you're already committed to rewiring muscle memory, you might as well design your layout to meet your specific needs too. It's highly unlikely you will encounter someone else's Miryoku layout in the wild and need to type on it.