OER PORTAL from Mumbai University
I've not seen it used on WE pages, but wikipedia suggests that there are a few fonts available on the wikimedia platform. See the article: HTML font family. Looks like the font would be specified in tags.
Also note that you can specify different colors and sizes for fonts (much more common on WE).
Where is it that you would like to use the alternative font? If you indicate the text/page, I could try out some code. And maybe offer a better suggestion.
Also, Jim Tittlser is the expert on wiki coding and would be able to better answer your question.
Hope this helps. Alison