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Thinking back to the various rationalist attempts to make vaccine. https://www.lesswrong.com/posts/niQ3heWwF6SydhS7R/making-vaccine
For bird-flu related reasons. Since then, we've seen mRNA vaccines arise as a new vaccination method. mRNA vaccines have been used intra-nasally for COVID with success in hamsters.
If one can order mRNA for a flu protein, it would only take mixing that with some sort of delivery mechanism (such as Lipofectamine, which is commercially available) and snorting it to get what could actually be a pretty good vaccine.
Has RaDVac or similar looked at this?