Hi all, looking for an alternative to lightwave switches in the UK, they are just too expensive!

I have 3 lights that are each controlled by separate 1 gang switches. I want to replace all of these switches for 3 gang switches, but not add any additional wiring. So each switch is only wired to 1 light but wirelessly linked to the others.

Any suggestions? I have natural wires at the switches if it helps.