These ideas are pretty close to discredited in cryptography engineering. Diversity in signature algorithms doesn't help when everyone uses the same algorithm anyways, and, more importantly, a negotiated algorithm makes it harder to recover from an new attack on algorithms, not easier: with a non-negotiable algorithm, you version the entire repository, and can reliably rule out vulnerable signatures. Negotiation and downgrade attacks have been endemic in "ciphersuite" schemes.

There's a reason the field is moving towards simple, modern schemes like this one, and Debian has more experience than most in trying to make broken, crufty old PGP work.

So, no.

It's OK to just say "I have no idea what you're talking about".