TBH we are also doing something similar, where we have a separate process that creates a winit overlay window and draws the remote cursor with wgpu, this process also handles screen sharing and remote control.

The process with the tauri backend are communicating via a socket, so you could say it doesn't really make a difference if it is electron or tauri in the end of day.

Though we are thinking of using egui for the rendering process in the future and then we could have the opportunity to integrate it in the main app (tauri has an egui integration for v1, which unfortunately is broken for v2).