The guinea hens is a good idea. Is there a way you can get some temporary fencing and set it up so the dogs can't get at the hens? I've seen this temporary chain link fencing that construction companies put up. Google Image "temporary chain link fence." You could rotate the fence around and hey, you might not get 100% relief but it might be pretty high, like 90!
I buy fresh eggs every week or two from a lady who has both dogs and chickens. She has a set up that's permanent, but her dogs, one a pit bull, do co-exist nicely with the birds.
The dispersion machine is also a cool idea. I hope you can find something that will do that because I, too, have had great success with DE.
I have been fighting fleas for over a decade now. My environment isn't quite as wild as yours, but pretty comparable. I am surrounded by woods and we have a lot of deer and other small wildlife. I have one cat that goes in and out, but my other two cats go out on enclosed cat walks, thus they can still get fleas. I used those flea prevention things like you mention and haven't had a problem with my cats having any reaction. I only use it in the summer, also, even though the cats go out all year.
For something like three or four years straight, I tried to get the nematodes going but after all that expense and effort, I don't notice anything. My neighbors did it, too. Maybe the nematodes are out there doing something, but I've never seen any results from it. It's a lot of work and effort, so this is a very "iffy" possibility.
There's a product called "Mosquito Barrier" that I learned about from a fellow DU-er. It is also effective for fleas, and it is a natural product. It is based on garlic. I think you should check this out. It is not terribly expensive and could really work for you.
Link.
http://www.mosquitobarrier.com/
Now I have some advice for any bites. Get the generic equivalent of the Benadryl gel and a few boxes of those circular Curad bandages. As soon as someone gets a bite, put the gel on it. Let it dry, and then put on a Curad circular bandage. This keeps the person bitten from scratching the bite. It works so well in helping get over bites faster. Inexpensive, too!
Around here, I don't dare go outside without a mosquito repellent, which of course, also repels fleas. I minimize the amount I need to put on by wearing long trousers, thus leaving only my arms for the repellent.
Most of the time I can get away with this Avon product, but when it's the height of the summer, l have to use that Deep Woods stuff.
Finally, I want to give you a big hug for rescuing those herder dogs. 
Cher
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