That sounds pretty good. I'll think harder about where I should consider doing the same!

But if you are self hosting then it ain't a "Web" font IMHO, and you contain the time/latency and page-weight cost, and probably eliminate the data leakage.

It's a Google font, just without Google infrastructure. The trick is to download a subset of the font, to use preloading, and if possible early hints. Then you barely know that it's there.

Web fonts are just fonts downloaded on-demand by the browser based on css rules.

Hosting the font file(s) on your own domain doesn't suddenly make them not webfonts.