Having already lost that many cats to these dogs, I think it is time you considered some more practical response. Sensitising the cat to the dogs will also provide the dogs with an opportunity to become over-stimulated by the sight of the cat,so not a good idea at all.
You will need to consider restricting your cat to a run or enclosure, rather than giving it free rein to wander at will. Cats adjust quite happily to this sort of environment and you can make them rich and interesting places for them to be. But it does require a little discipline, a willingness to have some potentially unsightly infrastructure there, and to spend a bit of money on the protection. I have done this for my cats in other locations, and, while there are dogs around here that are a worry, my cats seem to have sufficient instinct to keep themselves safe.