I was close to that some months ago. You only need 2 extra steps:

1. An add-on to make meshtastic send and receive messages from a local relay

2. A desktop implementation for Samiz to send and receive notes to the same local relay

When I checked, 1. already existed and I implemented 80% of 2. https://github.com/KoalaSat/samiz/pull/22

We are pretty close