Fedilab is a Fediverse client for (according to the website) Mastodon, Peertube, Pixelfed, Pleroma, GNU Social and Friendica. You can also follow kbin users (and, I assume lemmy ones as well, though I haven't tried). The app will allow you to manage several accounts on Mastodon, Peertube and Pleroma instances.
You can block content by keywords or phrases (either hiding them with a warning or hiding them completely) but I don't know if you can bulk upload keywords. (You can add several keywords/phrases at a time manually.)
Unfortunately (for you) the app is currently only available on Android.