Move VMs from vmswitch to vether0?

Hi all, today I've learned and been reading about VETHER(4). Virtual
ethernet interface on FreeBSD, wanted to try it for my VMs networking.

My VMs currently are networking through vm-vmswitch with a set of private
IP block; 192.168.2.1/29 (PF - NAT involved);

# vm switch list
NAME      TYPE      IFACE        ADDRESS         PRIVATE  MTU  VLAN  PORTS
vmswitch  standard  vm-vmswitch  192.168.2.1/29  no       -    -     -

My question is;
Is it possible to not use any virtual switch at all, but create a vether0
on the host, and assign it private IPs and aliases (thinking each alias IP
would be for each VM of mine), and make VMs communicate with each other
host machine through vether0 and its IP aliases?

In order to try these all above, on my OpenBSD VM, I;
Added in its conf file: network0_device="vether0"
Started it, defined it's static IP as; 10.0.0.2 (vether0 alias), and
gateway as 10.0.0.1 (vether0 IP).

That didn't work. Any clue?

Regards.