Bright suns, Arla. Welcome to planDisney. We're so glad you're here to share this question with us. Like Luke, It sounds like you might be interested in making some modifications to your lightsaber.
As far as we know,
scrap has only been available to those currently building their custom lightsaber at Savi's Workshop. You can always swing by to check with the Gatherers to see if anything has changed. If not, I recommend heading to
Dok-Ondar's Den of Antiquities where you will find a variety of accessories for your lightsaber. You might even say that these are the accessories you are looking for.
Since you've made the journey to Batuu, I recommend enjoying some time "on planet" and exploring the
Black Spire Outpost. I love heading to Docking Bay 7 Food and Cargo for a Cold Brew Black Caf. I always
mobile order this to save time. If you haven't already, download the
Disneyland app for this feature and so much more.
Well, Arla, while this might not have been the answer you were looking for, I hope the information I shared is still helpful. Most of all, I wish you luck and hope that you find what you are looking for during your travels.
May the Force be with you,
Michelle