Got a bee in my bonnet about the ZBrush - LW - Octane pipeline. So just tried this as a test.
Zbrush object. Decimated, then ZRemeshed to much smaller. GoZ to modeller to clean up some of the problems this caused. GoZ back. Then divided a few times and projected original. CReated displacement. Divided another few times, projected and created a normal map. GoZ'ed over to Layout, surfaced in Octane - Boom.
Love it.