Well, you've got different versions of Silent Hill, as you do of London, sort of. You've got the Other Silent Hill where Pyramid Head walks around and the normal Silent Hill that's just empty, and it's the same with London/London Below, so you could argue that Other Silent Hill and London Below are sort of on the same level of existence, in that only select people know of its existence and can get in there, and everyone else doesn't see it. Pyramid Head could totally visit London Below.

Also, I have seen all episodes of the Jonas TV show so far, and I like it. A lot. It is cheesy and ridiculous and quite amusing, so I think it's right up your alley.

And sending Kevin Jonas to Silent Hill is just ridiculously mean. You can't do that to him. Sending Frankie is A-OKAY. He'll fit right in with his being an annoying little child.