Is this something you put together yourself or are these commercially available?
The new update to nostr-signing-device has support for multiple nsecs and a bunch of other cool stuff
PR https://github.com/lnbits/nostr-signing-device/pull/19 by nostr:npub1794vv7hl7y6q2qw0y7m7h60rpphmvt5h7pzt5sr78z6assj6w0eqagwjhd
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Discussion
Um… no.
They’re available commercially on LNbits, I just upgraded the firmware 😁