grunfink, Call me crazy, but I've started implementing the #MastodonAPI into #snac, the simple, minimalistic #ActivityPub instance server written in ANSI C that everybody loves. When it's ready, you will be able to operate your snac account from a Mastodon-compatible app like #Tusky and the like.
I hope to have it working read-only in a couple of days, but who knows.
Stay tuned!