Is this possible? HDMI switcher based on a timer ?

You're likely going to need to hack it up. Easiest might be a HDMI switcher that does IR, and use software on a timer to send IR signals to switch it.

Alternatively, an HDMI a/v receiver with network control (or IR or HDMI CEC), but you're more likely to have autoswitching features you might not want.
 
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