That's the opposite of the direction Internet cryptography is going, given hybrid PQC and classical systems.
For signing only there are much more efficient PQ cryptosystems, with signatures around the same size as ECC. If DNSSEC ever adopts PQC it will be one of those systems.
Here are two of the earliest, and easiest to understand. There are much better ones now.
https://en.wikipedia.org/wiki/Lamport_signature#Short_keys_a...