Basically, my question regarding these two cold wallets is: do they support multiple addresses so that a person could divide their long term stash of bitcoin such that each wallet holds 0.1 BTC or 0.25 BTC, whatever breakdown is desired? In other words, over time as someone is stacking bitcoin to eventuially have 1 BTC, to avoid one day revealing their full holding via a "change address" when some of the bitcoin is spent (or sold) in a transaction?
Each of the mentioned cold wallets has at least 1 disadvanrage, in my eyes. The Keystone has a non-replaceable Li-On battery and requiires a firmware change if i only want bitcoin. The Coldcard Q1 has NFC that can only be disabled by cutting a connection on the circuit board.
As to preference of cold wallet, is there such a cold wallet that is 100% air-gapped and uses a BIP-39 seed phrase to recover the wallet on another cold wallet in the event the original cold wallet is lost, stolen, or the hartdware dies or malfunctions?
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