Google has revamped its Material Design Icons with 4 new preset themes:
Outlined, Rounded, Two-Tone and Sharp, in addition to the regular Fil
I ended up using IcoMoon app to create a custom font using only the new themed icons I required for a recent web app build. It's not perfect but you can mimic the existing Google Font functionality pretty nicely with a little bit of setup. Here's a writeup:
https://medium.com/@leemartin/how-to-use-material-icon-outlined-rounded-two-tone-and-sharp-themes-92276f2415d2
If someone is feeling daring, they could convert the entire theme using IcoMoon. Hell, IcoMoon probably has an internal process that would make it easy since they already have the original Material Icons set in their library.
Anyway, this isn't a perfect solution, but it worked for me.