I can create a bundle in patchwork but I can't apply it trivially. git-pw should support bundles, which means that bundles need to be added to the API.
M2 missed. Due to the bugs being blocked by this one, it must be ready early M3.
Proposed patch sent to the Yocto ML: https://lists.yoctoproject.org/pipermail/yocto/2017-February/034388.html
merged http://git.yoctoproject.org/cgit/cgit.cgi/patchwork/commit/?id=6afafb1b20c138091d793fb0df25375767017c0e