Light control switch protection
You can make it even simpler than that.

Figure 1. The manual switch can just bypass the timer and light sensor.
The triac or relay in the light control switch will not suffer from &quot;backfeed&quot; on the output (but note that there is no datasheet available for it so this is only an educated assessment).
That switch is a 2-way switch - up or down. Most confusingly they are sold in North America as &quot;3-way&quot; because they have three terminals or three wires.