Seems like a nice story but I just get triggered by the fact that he could dial another galaxy with just a goa'uld power source as well as the fact he could connect to Atlantis from a gate other than Earth's.
Since you have ancient knowledge, the most coherent thing would be for you to check your device that there will be dimensional doors, to see if it is okay and not get a surprise, caution, I recommend editing to add a paragraph
