Finally registered here just to express my interest in this!
But as I mentioned briefly on biip’s Discord server, I'd really want to vouch my support for katakana alphas, if at all possible. I understand biip’s dislike for dual legends in sculpted profiles, but even having only katakana legends (with no regular letters, that is, single legends, KAT Milkshake style) would be more than fine.
At the same time, if katakana legends were to happen, I'd kindly ask for trying a different font than on the original ePBT Extended 2048 set. While it certainly was aesthetically pleasing (as anything that touches biip’s hands!), it seemed to be sometimes quite far from how the kanas should correctly look like.