Thanks – again – to Michal Kubeček, there are now patches available for VMware with Kernel 5.0-rc1, here: https://github.com/mkubecek/vmware-host-modules .
There are patched
vmnet versions available for the latest 12.x, 14.x and 15.x releases, so for 15.0.2, do:
# git clone -b workstation-15.0.2 https://github.com/mkubecek/vmware-host-modules.git
I have applied these, and can confirm that VMware 15.0.2 now works OK with Kernel 15.0-rc1.
Robert Gadsdon. January 7, 2019.