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Remote signer like Amber for Android you are asking for.

The option bunker is also very interesting, even if not very reliable for me.

You might check out this as well to create keys either in browser or on local machine offline

Amber is fantastic, seriously @Bitcoiner1 if you don't use Amber you're missing out

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As far as I know, using Amber is still a hot wallet, your keys are on the phone...or am I missing something else?

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@Bitcoiner1 did you checked out the Nostr hardware signing device mentioned above?

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it can be in a separate dedicated phone that's only for amber

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