I just released a new version of Mastodon Redirect, an app that can act as a deep-link target for most Mastodon/fedi instance domains and redirect the link to a supported Mastodon client.
This version adds a ton of new supported domains, along with a method to enable them all at once. It also has an icon now.
Supported clients are #fedilab, #megalodonapp, #moshidonapp, and #subwaytooter.