Can you not use Avahi in the guest and get zeroconf?

Oh! Do you mean the issue is adding extra name resolution to a VM?

Have you tried this avahi alias trick?

https://gist.github.com/tomslominski/9d507acd4036952d65b2364...

Works like a charm, bit odd that you have a persistent avahi client process broadcasting per alias, but it's lightweight.

Interesting! I will look into this.