It would be nice to be able to initiate a ‘quickboot’ manually (outside of the scope of VUM), via HTML5, PowerCLI, API etc..
Looks like a few people have asked about this:
https://communities.vmware.com/thread/611865
Like the uservoice request says..
Would be nice to be able to do something like this via PowerCLI
get-vmhost <vmhostname> | restart-vmhost -quickboot
Workaround for vSphere 7 & 8 is to use the Custom ESXi "Dummy" Reboot VIB for vSphere Lifecycle Manager (vLCM). I assume it would work with Quick Boot as well.
Here is the equivalent feature request for Quick Boot on the vSphere ideas / feature requests site.
https://vsphere.ideas.aha.io/ideas/VSP-I-1137
It is labelled as planned.