I am going to stop researching this as I do not know the reasons behind you guys implementing a feature like this. I have gone ahead and moved the PXE vlan to the native vlan and just added our public vlan as a tag, and that works for now. I would love to see if the team at Canonical can take some of my work here, and finish the process of making this work. I know there are others looking for this kind of functionality, and it’ll be awesome if this setup just worked.
Another posting that I believe is related to this: PXE boot with vlan without native vlan set