Cookie persistence via iRule

I am very new to this but this looks like something that might help me if anyone could assist in clarifying what I would need to do...

I have an exchange server on our LTM running 11.5.3 and it has source address persistence working great for all users with the exception of a GOOD Mobile Messaging server that apparently the vendor says only works properly using cookie persistence.

I don't want to break Exchange by changing the persistence profile for all users but was wondering if there was a way to look at the source IP of the GOOD (GMM) server and change it to a cookie persistence profile instead. Is this along the same lines as the irule in this thread?

Does this mean I could assign both persistence profiles to the exchange VS and make source address persistence the default but use an irule to associate the GMM IP to a cookie persistence profile instead?

Any help is appreciated!