> If I were to write a script that correctly re-sequenced them (1, 2, 3, etc.)
> would that break anything?

No I don't think so.

If you want to use a "Search and replace" on style names there is a script here that can help with that:
http://moi3d.com/forum/index.php?webtag=MOI&msg=10416.2

- Michael