You're saying that in recent versions of Acrobat, the buttons look and work correctly, right?
And it's only when you try to open it in a version of Acrobat created in 2003, nine years ago, that you have a problem?
I think you're setting unreasonable expectations. There's actually a more serious problem than that, and much more likely to happen: Many Mac users use Apple Preview to view PDFs. Interactivity largely fails when viewed in Preview.
The answer, in my opinion, is to tell your readers that they should download the FREE Adobe Reader, or use a recent version (say Reader 8 and above), and if you're they are using a different reader that they may get unexpected results for viewing interactivity. And provide a link to download the FREE Adobe Reader.
You know, now that you say it that way, I agree. If their old version of Acrobat or Reader doesn't work, they need to download a newer free version.
Glad to be of help. Good luck on your project!