@Gardes
You are completely correct in the example of BLM. That is actually how my BLM is setup. You can just use /chotbar change to flip between the two. I wanted to just post another example to try and help explain they idea of being able to use macros to copy crosshotbars within combat.
In regards to SMN tho, /chotbar copy I think is better. If you just use /chotbar change, because the hotbars 2,3 & 4 are hidden. If you use the quick change crosshotbar button, you would have to manually change it back to that bar. If you unhide the 3 hidden hotbars. Then In combat, you would have a total of 5 crosshotbars to cycle though. Three of which would be the same, just pet abilties different on 3 of them.
I did try achieveing this with /chotbar display command. But I found, every time I changed job/class. I would have to reset the properties of the hidden hotbars. This way, I know each job has 3 hidden bars, of which I alway know where they are and I can setups thing to pull from.

@Runeseeker
Thanks for the update. I am glad we got there in the end. Now its working. What do you think on it? Any ideas to tweek it so its any better?
I will tweek my guide tomorrow to add a note to check the shared crosshotbars in the main guide. Its just a bit late right now

I am open to questions, comments, suggestions and requests in regards to help with crosshotbar and/or macros.