What about wrapping bleak to TCP or WebSocket bridge?
I think it is possible to make bleak wrapper that will allow BleakScanner and BleakClient usage over tcp/WebSocket, maybe with grpc.

Fort this approach needed:

• Communication protocol, and packet data type, few variants:
  1. Use ATT/GATT simulation
  2. Use json, grpc
  3. Custom binary format
• Server side:
  • discover/manage ble devices
  • control connections/actions/events
• Client side:
  • bleak-compatible backend that uses connection to server (should be simple with known protocol)
  • Running client or scanner like BleakScanner.discover(device='ws://ip:port) or BleakClient(device='ws://ip:port)

I can try to create simple example how can it work both side

The main idea is not to create some high-level abstraction, but to implement a virtual BLE Dongle and forward it between the server and the client