I’m interested in both of those too. I have a pair of Miura XXs that I’ve been being extremely careful with since they decided not to reissue.
Talking about otakis but are they not a velcro version of the katakis? Looks like it to me? Though have never used katakis As you were asking about stiff shoes/shoes that retain stiffness I thought I’d pitch in. Sorry if not helpful
Adam/Duncan are you talking about Otaki's or Katakis?!