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For mechanical part, I would use the low-voltage relay (similar to the one on attached picture). The push has to be strong enough to move the mechanical release and activate the push-button on the camera.
Only one transistor should be enough for the interface between intervalometer and relay, see attached schematic (that depends on relay coil resistance - if it is low, so high current is needed, you may need to use darlington array).
Just be sure not to use VCC higher than 5V, as intervalometer expects 10k pull-ups to 3-5V max inside camera. Also, it would be good idea to place a series resistor (3.3k) at the input of this circuit (D0).
Of course, you have to test this circuit before connecting anything.. Shorting D0 to GND should activate the relay (and your camera) when 4.5~5V is applied as VCC.
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