I rather doubt snorting some peptides as described will do much. There are some attempts to make actual nasal covid vaccines and I think they use chimpanzee adenovirus vectors. Ie you get a virus that gives chips colds and add some covid bits on. See the Indian one for example https://indianexpress.com/article/explained/explained-unders...

I think they also were talking of trying the AstraZenca one nasally which is also a modified chimp virus.