>>jessau+k2
This is something the TLS spec authors have prepared against with GREASE. The idea is the client adds some junk version information to its list of supported protocols. To quote: "Correct server implementations will ignore these values and interoperate. Servers that do not tolerate unknown values will fail to interoperate with existing clients, revealing the mistake before it is widespread."
https://tools.ietf.org/html/draft-davidben-tls-grease-00