I googled for a while but all threads I've found are pretty outdated. Daz3D can export FBX, but this way it's like throwing all advantages of Daz out of the window. Ideally, there should be a way to import Daz3D's model/rig/JCMs as Houdini KineFX rig + Blend Shapes SOP, so we can basically have a "Daz in Houdini".

Does such a tool exist?

Yeah, have been hoping for a bridge from DAZ3d to Houdini for quite a while. Not sure if any developers are actively working on it, but I'd happily pay for a plugin or script with such functionality.

Looks like on a private Facebook Houdini Artist's tread, there is someone named Bogdan Lazar that is developing a Daz3D to Houdini Bridge and is hoping to release this bridge on Gumroad this early August, 2022. This would really make my day.

That would be fantastic. Hope it comes to fruition.