One flight from Japan is going to be cheaper than 5 from Germany. And key members? In Barbatos? There aren't any. Yasuyuki does everything himself and just gets session members to fill in. If you wanted to, get Chuck Keller from Ares Kingdom/Order From Chaos to fill in on guitar since he wrote a few tracks back in the day. When Barbatos played Noctis fest a few years ago they just local acts fill in on the other instruments. Fucking Dan from Gatekrashor played bass.
But yeah, I was thinking this could be a decent possibility. There are plenty of wonderful bands in North America that would be great and, obviously, not as difficult or expensive.