A Korean group has published a paper on their vaccine, which uses genetically engineered Salmonella bacteria to present S spike protein to the immune system. Because it is not injected into the body, it comes into contact with the outer surfaces of the body to try to generate immunity there. That way, immunity generated at the outer surfaces of the body may stop the virus there and help stop transmission.
Unfortunately this vaccine has spike protein. It will likely cause vaccine injury like all of the other vaccines that have been used on humans so far.