Move to Hybrid-post-quantum crypto for digital signatures

[DogeProtocol]

Rationale

Falcon and other PQ crypto hasn't been time tested. Just like SIKE that got broken in a classical computer, it's possible newer vulnerabilities may be found in lattice and other PQ crypto schemes.

Why should this feature exist?
As a mitigation for short term till PQ crypto proves their resilience to classical computers over a period of time, it's advisable to yse hybrid cryptography, such as requiring ECDSA+Falcon (classical+post-quantum) for signatures.

Implementation

Do you have ideas regarding the implementation of this feature?
Are you willing to implement this feature?

[DogeProtocol]

The hybrid signatures, keys should be self-contained and shouldn't require clients and other parts of the application to handle two different set of keys.