I've never seen Weller use multiple primaries to handle different voltage standards (they've all been region specific, so the transformer would have to be swapped).
That said, is there a particular reason you're not able/willing to use a suitably sized step down transformer to get it to work?
I ask, as a 300W step down isn't that expensive.
![Confused :-//](https://www.eevblog.com/forum/Smileys/default/confused0024.gif.pagespeed.ce.5xOqKkq0Co.gif)