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My Solokey is hackable and firmware available under Apache/MIT (https://github.com/solokeys/solo1).
Unfortunately the easiest way to "export" is likely to rely on the RP, as if they effectively use the sign_counter they may flag such a key as cloned. They should ideally just let you register multiple (and that's an RFC 'SHOULD').
Not a shill by the way, just a happy solokey owner.
You don't need those either, perhaps https://github.com/herrjemand/awesome-webauthn is more to your liking than the website of a standards organization.
Most open source tools I've seen that implement FIDO use a shared Attestation cert[0].
[0]: https://github.com/github/SoftU2F/blob/master/SelfSignedCert...