Okay first, I wanna say sorry to Briano if I'm too disruptive about things I post here
LMK if it really is
But here's my try on the pubclicly-agreed-awkward Esc icon legend:
Personally I still prefer this icon shape compared to the X because it is the official Esc icon. And also the X is numerical modifier for multiply.
The reasoning behind this modification: while usually 1u icon is always centered (diamond, menu, ctrl, alt, but all are bottom keys), it seems the Esc is awkard because it is directly placed right before alphanumeric key which has left aligntment/top-left alignment. The other modifier keys are helped because they are having larger than 1u size thus giving the icon 'spare room' to 'breath' before we see the next keys (alpha keys; top left aligned). The case become more severe because in Hiragana legend it even not 2-line left aligned like usual latin legend but 1 line top left legend like latin alpha, this make the Esc icon looks more awkward. So what I did is simply make the same 'breathing space' by aligned the icon to the left instead of make it centered. I also change the shape of the arrow, the stock Esc icon is using different head shape than the other arrow appeared in Cherry's icon. I tried to make the icon smaller too but IMO it is not needed.
TLDR: I just made it left aligned and change the arrow head shape into what the other Cherry's icon looks like. Also, bonus new icon of Fn just for fun.
Again, for easy reference: