VMware Workstation is a type 2 hypervisor. You can install and share your VMs with remote users (give them console access). This functionality is free (you don't need a Workstation license) and you don't need add-ons.
I have played with both of the alternate solutions you have shared. These are not perfect, unlike what VMware Workstation provides (as it has, for long period of time).
You can of course install whatever remote server you want inside the VM but aside from that you can connect to a VM directly using VRDP.
But you can also manager your entire virtualbox instance using RemoteBox ( http://remotebox.knobgoblin.org.uk/about.cgi ) or from a web GUI using phpVirtualBox ( https://sourceforge.net/p/phpvirtualbox/wiki/Home/ ).
I'm sure there are other options as well.