the review tools would block any kernel or gadget uploads to the public store as long as they do not come from a canonical employee (this is a security/store policy atm).
there is work being done to losen this policy a bit for non-
commercial images for developer boards (i.e. beaglebone, raspberrypi, rockpi etc), but this is not final (it could be that there will actually be a public brand store for such gadgets/kernels and a community team similar to snapcrafters can do uploads there, but it could also be a completely different solution)