To cut a long story short, I ended-up installing Electrum (newbie here with it), and was unable to find my original Legacy address there (the address has 0 balance and 0 TXs historically). I played around with the derivation path (which I though was not part of the solution – and it wasn’t), the xPub, and a few other things, and still could not see my original address amongst the 20 displayed in the Electrum Legacy wallet by default. I tried to sign a message by manually feeding the address, and, if I recall correctly, Electrum stated that the address was not included in the wallet I had created.
It wasn’t, until I played around with the console that I got to finally see my address, after extending from 20 to 200 addresses by means of:
Personally, I believe that using a hardware wallet to sign a message here in the forum is like killing an ant with an atomic bomb (I don't know if this expression exists in English, it is common in Portuguese)
You don't need all that security for that. And as Welsh said, a good idea is to have the staked address completely separated from your funds.
I have the seed and private key of my staked address noted down in a paper, and that key is now imported into my mobile wallet. If I need to sign a message again from that address I can just paste that seed in iancoleman.io, get the private key, and sign it using any software. Ofc I would never do that using my ledger nano seed, but it is very convenient to do with a 0 balance address.
I know other members here do that as well
-----BEGIN BITCOIN SIGNED MESSAGE-----
hey DdmrDdmr. merry Christmas and a happy new year for you too!
-----BEGIN SIGNATURE-----
1QHHA6n5pNc9Ci9jLwREeNMEjpvPjj51Fj
ILSNOc0QnX5Ixpu+uj/0jF2IinvkpC3VHi8ABRUlXs7hFfaCh2NFj9QbQSzcl1KVChFQVUQkZ/d2TsInnP59pU8=
-----END BITCOIN SIGNED MESSAGE-----
Especially, my gmail account that I no longer use.
Which email are you using now? Protonmail?