Two shutter switches controlling the same blind

[Charman-D]

I have two shutter switches controlling the same blind (similar to a two-way switch).
How could I synchronize both devices so that:

when device 1 opens → device 2 opens
when device 1 closes → device 2 closes
when device 1 stops → device 2 stops

The attributes currently exposed by the devices are:

is_closed: true
current_position: 0
device_class: shutter
friendly_name: shutter switch 1
supported_features: 15

This is how is_closed behaves:

position = 0 → is_closed: true (state = closed)
position = 1–99 → is_closed: null (state = unknown)
position = 100 → is_closed: false (state = open)

Previously I was using the LocalTuya (xzetsubou) integration, which exposed a raw_state attribute (opening, stopped, closing). That made it easier to synchronize the devices using Home Assistant automations.

Any advice would be greatly appreciated.

Both switches are Tuya BSEED roller shutter switches using the Tuya Local integration.