Thanks for giving this topic its own—eh—topic. 
I’m an admitted fan of the Tokyo66, but I understand your quest. Proper 15u 60% offers a huge amount of possible cases. Had this dilemma when looking for a (non-HHKB) 60% PCB with dedicated cursor keys, too.
Regarding your layout suggestion: I’d say that works very well if you’re fine with planck- respective HJKL-style cursor keys in one row. (I can’t. Need an upside down “T”.)
So here’s my attempt on this:
KLE link for this layout (Yay, embedding keyboard map data directly into a Keebtalk posting. Do I get a badge for that? 
)
It even has the advantage over the original HHKB layout that it uses a common 6.25u spacebar instead of more seldom 6u spacebar. And the blocker sizes differ less—they still differ, but are less obvious IMHO. (See below for comparison.)
Obvious (and IMHO only) disadvantages are:
- the relocation of the
/?key. - loss of the original Fn key. (I’d just use the right Shift key for that as I never use it anyway. Or SpaceFn with tap-or-hold. Or maybe
/?on hold while still being/?on tap.)
Having this said—eh—written, this is more or less a direct reply to @0Name:
Definitely disagree on this. But then again, I’m a 40% user, most of my keyboards don’t have a right Shift key and I never missed it.
And I can’t really follow the argumentation that the 1u keys will scare away HHKB-fans. The symmetry everybody claims to be in the HHKB isn’t really there—as I mentioned in the other thread @kimslawson referred to: Alone the corner blockers of the original HHKB have a size difference of about 1u:
