Sounds pretty good. I don't trust devices with secure elements. So I would definitely use a passphrase with the device. Back it up. Confirm my backup. Then wipe it.
I'm assuming that wiping the device also wipes any saved data in the so-called secure element. I don't know. I use a Trezor Model T that doesn't have a secure element. Then I wipe it for cold storage.
I also like Super Shamir for backups. Because it's fun to play with the possibilities. Sounds like you got it. Best of luck..ππ§‘π