So thanks to this hint I got it working for myself. I have BPs of GCs that I wanted to be able to reuse freely. I created box collisions in my BP that serve as points to spawn in anchors points. In the construction script, I loop over each geometry collection component and turn off the physics, then on begin play I loop over each box trigger, spawn an anchor point of the same size, add those new anchors to each GC, and reenable the physics for each GC.
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