Override default style from the PHP script?

[Acido]

Testing our site updated to vb4 from vb3.8 we found that most of our mods still works fine. But the style it's the point. Of course any mod that use vb3 templates looks horrible using vb4 styles.
We think that it's a good way to save time (while we update the changes and modifications on each mods templates to match the vb4 style), force some scripts to use the vb3 Style during their run.
Perhaps this way let us keep our site running with all our old mods (vb3 and vb4), meanwhile we start the long templates update process.

Could it be possible?

Thanks!

[Acido]

Bump No one know how override the default style from the php script, o a better idea?