As Griz mentioned, why not try to nebulise it into the nasal area? Cant think of why salt would be necessary, I used a vaporiser in past years with CS, breathing in the fine mist(obviously not as good as a nebulizer and with attention so as to not breath in droplets,). No burning sensations and it worked well.
If you cant get a perscription for a nebulizer, an ultra sonic transducer can be bought online cheaply and rigged as a DIY nebulizer. Quite simple.
(btw Dont forget/neglect tincture of cayenne(and dmso), diluted, for bringing healing blood and lymph action to troubled areas).
btw. If we nebulize the CS we wouldnt be in danger of comprimizing the helpfull intestinal flora, so we could take in a larger quantity daily.