I have a devops guy trying to push me to use Vagrant at the moment, but I am aware of these issues with virtualbox. I was thinking about using one of the lxc shims, but now you have me curious, how useful is openshift in that "I want to spin local vms up for testing" approach? I thought it was much more geared to server and not workstation, as opposed to vagrant.
Of course others are right, virt-manager is probably a better replacement I think.
So OpenShift (or OKD) is just Redhat's Kubernetes platform. If your dev team isn't already in a docker-like workflow, it's going to be a hard sell. I've found many devops-y people love to be able to SSH into the environment to change code as it runs, and that's not possible with an environment like this.
You can spin up KVMs in OpenShift, but I have the feeling it's not going to be quite what you're looking for. I suppose it's all going to be a matter of what workflow is most comfortable for your devops people. If you have an OpenStack install, Vagrant can control those AND they can login and poke around.
Also FYI virt-manager is deprecated in RHEL 8, and is superceded by Cockpit.
Of course others are right, virt-manager is probably a better replacement I think.