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What speaks against multisig in this case? Just use a 2of3 multisig then you have your "2 seed" solution.
I also still have two wallets using this scheme: I use my signing device for a wallet which requires only one signature for spending. But then I use the same signing device together with two other seeds I generated using Electrum for a 2of3 multisig wallet.
Basically, the singlesig wallet is my onchain cold wallet for easy access whereas the 2of3 is my cold storage "vault" where I put coins I don't intend to move for a very long time.