Vlad Costea offered us this pro tip:
Pro tip: use one of your spare hardware wallets (Trezor, Ledger, BitBox02) as an authenticator device which replaces your regular SMS 2FA or Authy App. It works really well with Twitter, Gmail, Facebook, Dropbox, and a bunch of other websites.
The instructions on how to do this are found here:
Get a Ledger Hardware Wallet Starter Pack with a $25 Voucher
Get a Trezor Hardware Wallet (Caution, only buy from the official store, never from a reseller or second-hand)