Well, OpenVDB as a library is completely inside Blender, the problem is that the standard is not the same, you have two options:
Wait until this is fully implemented, it will be in 2.81 or 2.82, I don’t know.
Hire a developer to adapt the Tangent Animation implementation, it should not be so hard (I presume, but I’m not sure), the Tangent Animation code is here, it’s a 2.78 version, but a developer could be able to extrac useful code from it and adapt it to 2.80:
IMHO this is the best path for a medium studio, is not to have the developer always under your pay check, just talk with a dev to evaluate the work and to pay it per hours.
I have a pair of good experienced Blender developers in mind that are capable of doing something like that, I could ask them if you want.
Ideally after you have that implemented that patch could be published in developer.blender.org and could be reviewed by Core Devs to be implemented in master.
Regarding hair, you may be able to import it as curves with Alembic, I think that could work.
If you have questions please ask away here, or send me PM, I’ll try to help you
I run a small studio and the transition was hard at the beginning, but after a few weeks we were happier than ever in your case should be easier since you are not translating the full pipeline, just some parts of it.