It might not be exactly what you're after, but I can highly recommend any of the TriggerTrap devices for a multi-purpose camera trigger. If you happen to have a couple smartphones handy, you can tether one to the camera, and sync a second one wirelessly as your remote trigger.

I have the Arduino, Android, and IOS models, and I should really use them more often. Most recently I modified the arduino edition to add a photobooth mode from the AUX input. Lots of fun!