Yes of course. This diagram from the Facebook link is correct.
The confusing part for me was that the second switch requires moving L2 to Common which seemed counterintuitive to me. But in this two-way wiring setup it does make sense.
To clarify the steps (which in some ways is much easier to comprehend than interpreting the diagram):
Switch 1 (with permanent live)
- Disconnect permanent live from common and connect to L of the Shelly 1L
- Connect a jumper wire from O on the Shelly to L1 on the switch (note leave the existing L1 wire in place)
- Disconnect L2 from the switch and connect to SW1 on the Shelly
- Connect a jumper wire from SW2 on the Shelly to Common on the switch
Switch 2 (with switched live)
- Disconnect L2 and connect it to Common (note you should check that L2 is actually L2 on both switches. In my case they were the same colour which makes sense.)
- Note - leave the common in place so you have two wires connected.
Finally, when configuring the Shelly, make sure you have both Switches in Edge mode.
Glad to finally have this up and running in my hall and hope this method helps some people. I have a little bit of flickering even after installing the bypass, but I believe the bulbs play a part in this too. The actual install is spot on and as far as the wife is concerned, the switches are the same as they’ve always been! Winner.