Hey,

Just to let you know I've been in talks with @dherault about serverless-offline and there seems to be potential to integrate lambda-wrapper and a wrapper for online invokation under one general function that keeps an eye on env.IS_OFFLINE variable.

I've outlined your project briefly here, after I was looking for answers to this.
dherault/serverless-offline#55

Now it's just a case of having a if statement in the invokation chain , but it's a rather heavylifting to code everything twice in where you call the lambda functions so that it can call any which one depending are we online or offline.