Bright Suns, Didenur!
Sounds like you are flying to Batuu soon! Watch out for the First Order. Stormtroppers sometimes roam even this remote outpost.
On my last visit to Epcot, I found the perfect replica of Spaceship Earth in the form of a cookie jar. I was able to ship it home directly from the shop. At
Droid Depot, let a Cast Member know at the time of purchase you intend to send your guys home after enjoying a little droid interaction, I believe there would no problem returning later to see that your souvenirs are safely mailed. Part of the droid fun is experiencing their interactions in Black Spire Outpost.
Savi's Workshop-Handbuilt Lightsabers is not a shipping spot, so you will need to send your creation from the Droid Depot or Dok-Ondar's Den of Antiquities, so you are free to walk around
Star Wars: Galaxy's Edge with your Jedi weapon until you are ready to mail it home.
Wishing a smooth journey through hyperspace!
Elisabeth