Totally, that's how cvm its implemented and specified, it uses nostr as a transport, auth, and discovery layer. It publishes and listens subscriptions. Using relays as kind of hole punch mechanism you can run anything and make it instantly available reachable. I'm curious for that old message queue approach you are mentioning, it's documented anywhere?
Discussion
RabbitMQ is an open source version. Message Queue Architecture was the hottest thing 20-30 years ago in government. That’s what Estonia implemented (still using), but it all got captured by proprietary vendors that made it stinking expensive and restrictive. I am still trying to remember that name of the vendor that captured it all (still trying). Eventually the dotcom craze made it uncool.
Over the longer run, there were open source versions like RabbitMQ - successful- but now I see NWC blowing the doors wide open on the architecture.