I don’t think it is possible to run android without any binary blobs from vendors or other. They try to limit it as much as possible, while still remaining practical and offer compatibility.
They build on onlyoffice for the office tools and use parts of nextcloud foe the desktop sync xlient but also add custom functions. I used it briefly and it looked nice, but I have my own nextcloud server with onlyoffice, so I had no need.
I thibk they offer a free trial right? Just try it out
I don’t think it is possible to run android without any binary blobs from vendors or other. They try to limit it as much as possible, while still remaining practical and offer compatibility.