Well the original i think would get in throught the 25+ year deal, like all the kei cars here.
The replicas would be highly restricted tho, brought in under show/competition car and basically cant be driven on streets. I dont think they qualify under kit cars either.
I mean with a car like that, you're probably only bringing it to shows anyway. I think they allow for 2.5k miles to be driven a year or something which would be enough to drive here and there. The only issue there is it will not apply for show and display since one requirement is to be out of production and another is that it can't be a kit or replica car. You should be able to under the "Substantially Similar" rule as it's a replica of a car that was sold here and has an engine that was sold here