Yeah, you can get multiplugs/surgestrips here in the U.S. that allow you to plug in anywhere from two to 14 items. However, you would need to plug in one of each of your adaptors and possibly even the step ups into that.

However, I'm not clued in enough other than that. Your best bet, if you can stomach the international call, would be to call a Radio Shack and ask them what their advice would be. I'd recommend this course of action over an e-mail simply because you can never guarantee if an e-mail will garner a reply.