Dual WAN routing/bridging by MAC?

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I have been playing with routing specific devices out to a second WAN device using several threads I have found... however I am not 100% satisfied with the solutions... mostly because I really want these devices to get their IP from the second WAN's DHCP, rather than my router. I want devices (actually VM's) with a certain MAC to feel as though they are directly connected to the device on port 4 of my router.

Is there any way to "bridge" devices on my LAN to the second WAN device... such that ALL traffic from a particular MAC address is forced out that connection... including DHCP broadcasts?

I realize that VLAN tagging could do this, if I had a managed switch, and devices that supported trunk connections, etc.

I'm sure I could bridge a port, but because these are VM's that would mean that the host system would be bridged too. And it would prevent me from plugging into any other port.

I think what I want is call a "mac vlan", which I found referenced here: http://www.pocketnix.org/posts/Linux Networking: MAC VLANs and Virtual Ethernets though I fear this is something non-standard?

I'm open to any ideas!

 

[confuzed]

It looks like netgear supports something like it: https://kb.netgear.com/21586/What-i...ith-my-managed-switch?cid=wmt_netgear_organic

 

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To respond to myself again... I found this https://sreeninet.wordpress.com/2016/05/29/macvlan-and-ipvlan/, which suggests it may be built into linux... need to do more research... but this looks promising: https://github.com/RMerl/asuswrt-me...e/src/router/iproute2-3.x/ip/iplink_macvlan.c