After some more research I found people suggesting Weld-On #16, an acrylic adhesive that will actually melt PLA. A little of this applied to the parts, they said, and you can solvent weld PLA just ...
If you need something quick and reliable, check out Testors Cement Glue. Shop this article: Weld-On 3 Acrylic Plastic Cement with Weld-On Applicator Bottle with Needle and Gorilla Super Glue There ...