Is it possible to reset origin point for in-engine-made static mesh?

I’ve been creating some tree static meshes using brushes, but when spawning them using the foliage painter some of them spawn below ground. I believe it’s because their origin point is set above where it should be. I suppose the order in which you select a group of brushes when creating a static mesh is relevant to where the origin point is.

Do I have to create the models again or is there a way to reset said point and still be able to use them as vegetation?