Shandy:
A little disappointed nobody else has any input.
Maybe no-one reading this board over the past two days has done anything similar? This is actually quite likely, you know. There are a couple dozen frequent contributors around but the rest just comes and goes.
Other than that, you didn't have any actual questions.
Nonetheless your description doesn't sound like it will work. I2C is a communications protocol, and doesn't trigger events other than related to its own communication. But with the very limited info you have provided, that's all there can be said about it.