I decided to take a small contingent of Imperial Guard allies to boost the objective holding and anti-air elements that I feel the main Ork codex lacks. As such, I took a company command with a mortar, a veteran squad with a las cannon and a Vendetta gunship. They worked amazingly well and I'm really impressed with the veterans especially, who sat behind the aegis line with the Icarus las cannon receiving orders and killing stuff!
I didn't want to field guardsmen though, so I instead settled on a 'grot mercs for hire' idea. Here's the plane :)