With spiced ham's further explanation, I like his suggestion: Compost it first for a full year and then do your thing with it. With respect to his profession, there are many others with similar backgrounds who are not so well versed in the biology of the soil.
What you are getting from the tree trimmer is sometimes called Ramial Chipped Wood. I might lay the chipped wood out and use it for mulch while it was composting rather than piling it in a pile, but you're going to have to keep it moist no matter where you put it. Sometimes it is easier to keep moist when piled up.
I've tried many ways to keep my pile moist and have finally settled on a misting type nozzle. Shower heads waste too much water. The mister water might put out a gallon of water per day. Some might drift away in a breeze, but if you leave it on 24/7, it will wet your pile through and through without making it soggy. The mister I use is the kind used to cool the air in the hot, dry desert. It is not one of the Toro misting nozzles used to water plants. It really throws off fine droplets that seem to evaporate quickly, but somehow everything underneath gets wet.
As to what to use to increase the "nitrogen," keep in mind that it is microbes that cause the decomposition of wood, and those microbes need their nitrogen in the form of food, not chemicals. Inasmuch as urea is a synthetic recreation of a natural molecule, it might be good as food for the microbes. I prefer to use true organic fertilizer made from grains to supply additional nitrogen. Thus I agree with those who suggested alfalfa pellets as a "nitrogen" source and disagree with those who suggested ammonium sulfate (a salt). In organic fertilizer the nitrogen is supplied in the form of protein, which contains nitrogen molecules but is a real food.
Regarding the nature of the Soils forum: we've all been there borderbarb. This forum just seems like it should be organic, but it really isn't. Your wording was, "This is a soil and compost forum ... with a general viewpoint in favor of protecting the life within our soils ... which is adversely affected by chemical fertilizers." . After years of reading this forum you are exactly correct that the "general viewpoint" is in favor or protecting life in the soil. It is just not the only viewpoint nor are other viewpoints rejected as they might be in other forums. So the OP has a valid soils question, this is the place to go for answers (such as they may be). At least he's not asking a question about roses on the Pecan forum.
Here is a link that might be useful: On Ramial Chipped Wood - then follow the links
Q