You could rent a locker for the droid, opt to have the items shipped back to your home or take a break and return to your resort or car. Otherwise, you’ll have to pack them around all day.
We purposely set our appointment times late in the day. For the droids, we did the last appointment, then left the park. For the light sabers, we did an appointment right before dinner. Then, it was dark and we were able to take pictures. We even found a Disney Photopass photographer and got some great pictures of the kids!
You should be able to ship home from any major gift shop location. In Galaxy's Edge you ccan do so from Dok-Ondar's, Droid Depot, or First Order Cargo. The lightsaber building experience will not do it directly from there, but you can take it to any of those locations or other gift shops in Hollywood Studios. It is easy and reasonable.
I shipped mine from Disneyland from First Order Cargo. They charge based on the total cost of the items and had a faster/more expensive option and a slower/cheaper option. It was nice to not have to carry around the cumbersome saber, but lots of people do it.