No, we would use something similar to S-Expressions [1]. Parsing and generation would be at most a few hundred lines of code in almost any language, easily testable, and relatively extensible.

With the top level encoding solved, we could then go back to arguing about all the specific lower level encodings such as compressed vs uncompressed curve points, etc.

[1] https://datatracker.ietf.org/doc/rfc9804