Maybe I'm missing the point of some Open Graph properties, but in this case... what's wrong with just using the HTML standard <link rel="icon" href="/path.png"> tag, which is already well-specified, well-supported, and even includes an optional "sizes" attribute?
In general we've found that companies are using the icon rel for favicons (16x16 icons) which don't do a good job of representing a company logo at larger sizes.
If you're looking for positive intent, maybe propose that sites explicitly set the sizes attribute? Either way, you're asking folks to modify their <head>. Embracing the icon rel avoids duplicating effort.
https://html.spec.whatwg.org/multipage/semantics.html#rel-ic...