Getting closer I feel
I think what we may need to look into is compat and compat-wireless. This is a workaround that David used for wl1251, which is close to our wl1271.
Good thing though, the wl1271 is a newer device, and we might just get this updated to support injection, as opposed to wl1251, which have already been confirmed as super-low priority since it is a old device.
A few posts back, I posted a link to this.
Keep on moving guys