Huck,
I have a similar situation on Skye. I am about 1 1/2 miles from the sea, but sometimes you can taste the salt in the rain. Almost constant wind stunts my
trees and scorches leaves.
There is some hope however.
Many mediterranean plants don't mind the salt: rosemary, lavender, thyme for example. Asparagus, and globe artichoke don't mind the salt. Asparagus is supposed to love it, but it is also supposed to dislike wind so my main crop is in the polytunnel (first harvest for dinner last night😋)
There are other seaside perennials like seakale and sea beet that may be worth a try. I've not had much joy with the former: it tend to disappear over winter, I think it probably needs a really well drained spot. The latter does much better: again somewhat short lived. Parsnip seems to grow OK and
perennial kale. I have Daubentons (I think rather than Taunton Deane which disappeared). I have actually been planting this as a pioneer shrub it does so well!
Here most soft fruit does well for me: currents, gooseberries and raspberries, although they prefer a bit of
shelter, black currents in particular are robust.
My best suggestion is to grow some sheltering bushes, that will cut down the killing wind a bit: sea buckthorn is the obvious one here, many Elaeagnus, which are similar nitrogen fixing sometimes spiny fruiting shrubs may do better for you.
A good read on
gardening in extreme exposure is Rosa Steppanova: 'The Impossible garden', if you can buy/borrow a copy. Although mainly ornamental, the techniques
should still be applicable.
Good luck!