I use a 6a myself, but later models will get you the longest graphene support, if you keep the phone. Not sure about the mnemonic keys but still need to add an nsec into Amber to protect keys. I am not that into browser extensions. Creating a new key in Amber is best. I only use the device for nostr/lightning and only with tor/orbot. Wifi only airplane mode. To each there own.
The latest version of amber generates a mnemonic...
👍 I thought u were suggesting that you derived your new mnemonic from your old key.
No I'm not sure how to do that. I actually did it in blue wallet on another device and enters the words into nostros which gave me the hex for amber. (Amber lets you creat but not the other way around yet.) Nostr uses the same cryptography just a different path... So technicaly I can use my hex as a bitcoin wallet.