Do you think people would use it?
I don't think so.
Most people who are staking addresses here are coming from bitcointalk forum and they are all using bitcoin wallets/addresses for this purpose.
In Trezor Suite, you can create a signed message using the ETH Address in Trezor (BIP137) or Electrum format (compatibility signature format).
Yeah, I know Trezor Suite has nice tool for signing messages, question is if it's compatible with all other ethereum wallets.
I can confirm that for Monero coin you can use Feather wallet to sign/verify messages and it works almost identical like in Electrum wallet.
Other Monero wallets probably have something similar.