Need help with wiring 2-way. Shelly plus 1 or sonoff zbmini or sonoff zbmini-l

Hi, I have a wiring to a light which I can't figure out how to make it work with a smart relay or switch. Any advice on how to make it work would be appreciated, or suggestions for alternative devices. Also if there is a name for this wiring configuration?

I'm in Ireland (similar wiring to UK). It is a new build 2020. I have neutral at some switches.

I have the following devices:
Sonoff zbmini
Shelly plus 1

Im open to
Ideally being shown how to wire with what I have.
A smart switch with a two way output (but is already at a 4 gang connection, so a 2 gang or 4 gang would be needed)
Putting on a smart switch at either end.

Lighting configuration
5 lights in a row.
1 light in a separate location
4 gang switch on ground floor (switch A)
1 gang switch (switch B)

As best I can figure out how the lighting works is as follows.
Switch A gets power from consumer board / main leg of lighting daisy chain. It feeds this power into com.
Switch A has S1 and S2 running to switch B.
Switch A has a switching neutral returning to it from the light.

Switch B has the S1 and S2 entering from switch A.
Switch B has two switched live wires running out from com. (1 to the 5 lights, and 1 to the single light)

1st of the 5 lights has a switched live (feed from switch B)
1st of the 5 lights has a switched neutral returning to switch A
The 1st of the 5 lights has a live, neutral, and earth feeding onto the remainder of the 5 lights in a row

The problem I see is that I don't have live power where I need my switch. I think it has to be at switch A,

Switch A is the ground floor.
Switch B is the upstairs


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(upload://4DPL4CiLOEJ6Modd6MrdHJQP8LV.jpeg)

To answer my own question for anyone looking in the future I figured out a way to make this work with my shelly plus 1, but wasn't able to figure out how to do it with my sonoff zbmini (preferred device to use).

I'll post both devices if anyone could suggest changes to my zbmini to make it work I'd appreciate it.

Shelly plus 1 (working).

Sonoff zbmini (not working)

Please take necessary safety precautions and copy at your own risk.

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