Synology has a full Google Drive replacement with apps built-in.
I think the fact that I'm The first person to mention it here, and the fact you didn't find it yourself, is revealing about the true level of demand for such a product.
Of course, there's no way to try it or to buy it from there....
I see random devices for sale for under $200, but I'm not sure if they include it. If I bought it, I'm not sure how well it works.
We have no idea of the level of demand for a product that well-hidden. The fact I just spent 5-10 minutes without figuring trying to figure this out without success means we have no idea.
As a footnote, I do have a random machine running a random online office suite. It works, but not well enough to be generally usable.
I think the fact that I'm The first person to mention it here, and the fact you didn't find it yourself, is revealing about the true level of demand for such a product.