Follow up (surprised at some of the matter-of-fact "answers" by the way).
This is possible with the Essentials Kit. From VMware licensing:
"I would like to inform you that vSphere Essentials Kit shall be used on 3 Host(s) with - 6 CPU(s) <Processors> in total. vCenter server essentials can only manage 3 hosts = 6 Processors / CPU(s).
If you have 1 Host(s) of 2 processors and another host of 4 processors you could still license and manage Host(s)."
The vCenter Server license is the limiting factor.