you mean something like https://www.nitrokey.com/products/nitrokeys ?

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Kind of.

Except you could write your own software as well.

And integrate it into other systems, not just USB.

You could write your own software for it. You just need one with unlocked bootloader

But is the firmware on the SE? Probably not.

Nor sure, you could ask on their forum or github

Their SE I think is a ZeitControl smartcard which is from a previous SE generation, and is locked after production