Isn't that the stuff vaccines are made of? Could someone develop antibodies toward that strain from that?
Inactivated/dead viruses are one (of several) vaccine technology. However what is time consuming is that producing enough such material to produce large numbers of doses requires culturing and processing large amounts of the pertinent virus. E.G. in the case of the annual flu shots, that process takes several months, and by the time the anticipated quantity of vaccine has been produced the influenza viruses then in circulation may or may not be what were circulating at the time that year's vaccine production was planned.
I expect that there is a vaccine for this particular virus variant, but because the virus hasn't crossed over to humans to a significant degree, it probably has only gone through whatever process there is for veterinary usage. So at this point the issue is producing enough vaccine to avoid a mass extermination of poultry, and the vaccine company deciding whether to do whatever process there would be to get the existing vaccine approved for humans.
