I like the list, really nice.
For DNS and domain registration, have you checked out DeSec 🇩🇪? I use them for quite a while and I am very happy.
Also, for Hardware security keys, ... I know Yubikeys are the most promoted ones. But check out Token2 🇨🇭. They support all the fido2 features with 300 passkeys, openpgp, totp, .... And the price is nearly half of a Yubikey.
* https://blog.tinned-software.net/framework-expansion-card-for-token2-t2f2-security-key/
* https://blog.tinned-software.net/fido2-security-key-login-for-id-austria/