Dark (New) on Nostr: Hi all. I want my next set of additional signing devices to be a different ...

Hi all. I want my next set of additional signing devices to be a different manufacturer for a little bit more diversity. Anyone know aside from CoinKite hardware, what would fit this bill:
- two units that can be clones of each other
- no internal battery
- no display or keyboard
- airgapped (ie uses removable storage media for PSBT’s and import/export, rather than physical connection, NFC or Bluetooth)
- Bitcoin only
- no proprietary software required for firmware upgrades or building transactions (ie works with Sparrow)

Thanks!

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