Hi Philip - I see you are using an alias these days.
Last questions here -
1) Do you have access to the existing stores where you will add the captions and secure (either in person or via remote)? It is easier if you have this for your work that you will have to do.
2) For new store builds going forward - are you using a template?
They are definitely added from the SO side to HQ. The reason why I ask about your access to connect to the stores somehow is that it will be 100% easier and more effective for you to manually put the security in place and verify the captions are correct. They should not be able to change at the store for your HQ environment that you are supporting.
Let me know and we will go from there.