You may be able to register with a Misskey instance that isn’t Japanese but still federates with misskey.io. For instance, I made an account on misskey.social which is an Italian-based instance. I still see posts from misskey.io, from anybody there that I follow.
Not sure what it looks like as a guest, but when I set my feed filter to “Global”, it is lightning fast. If you set that filter to “Social” you’ll see only who you follow, which will naturally slow it down.
Be warned that misskey.io has a lot of R34 art on it - keep that Sensitive Media blur up and running.






mbin does federate e.g.
@syuilo@misskey.io, the founder/lead developer of misskey. I can at least see the text content of their posts and replies, but not image attachments and reactions.