A flat round plastic disc (same diameter as Flic) with hole in middle
Please create a flat round plastic disc (same diameter as Flic) with hole in middle, so hole will match the size of normal switch (eg, for Australian switch hole is 20mm x 20mm x 5mm deep). Disc will sit over original switch (hole will still allow original switch to operate) and Flic will sit over disc to cover original switch. When servicing light fitting (changing bulbs), you can remove Flic and operate original switch.
Antonio Elinon commented
Another variation is same disc and hole, but with a cover so Flic will stick on properly, in case hole makes it difficult.