Unfortunately I think the best option currently is to download and build open-source extensions yourself and add them in developer mode, but Chrome will bother

Unfortunately I think the best option currently is to download and build open-source extensions yourself and add them in developer mode, but Chrome will bother you about running developer extensions every time you start the browser so that's not ideal. My own strategy is just to limit the number of extensions I use to a small number of ones from established/trusted entities, but it pains me because I publish a couple extensions and I am not an established entity.