acquired a Hatta Swan HS in really good condition at a great price.
the only woe is that it has JIS crown race, 27.0mm. obviously my fork would need ISO 26.4mm.
while i don't want to give up an opportunity of having a nice high-end Hatta HS,

thinking of finding an interchangeable crown cone, that would fit here.
(Hatta do have 26.4 crown-raced Swan HS, but they don't come with part by part.)

my initial and naive thought is that if any from a Campy-copied style HS could fit with no serious problem.
there's no 'sealed' or any sort of fancy additions here. straight-forward '80 style HS we are talking about.

see some cheap old Schwinn branded cones and Tange Levin ones easily on the web at cheapo price.
there's also a DS crown cone (fron their Pista line) available on Loosescrews.

bought a cheapo on on ebay already to try it myself,
just would like to get any knowledge or anything to keep in mind etc.

any insights or experience would be appreciated.