A huge part of helping a child with written output issues is providing variety in the equipment and tools you use with them. Because they do not enjoy writing and find it difficult and tiring, you have to capitalize on opportunities when they are attracted to any kind of writing implements. Usually when they are interested in say a particular pencil they will inturn write.
Consider acquiring the following for use at home:
-electric plug in pencil sharpener. I found it very useful for my child to be able to instantly sharpen pencils, it also made him more interested in them!
-gel pens. I'll write more specifically about these in another post, but they sound and look different when you write with them. Children often complain they don't the feel of a particular pen or pencil, it's important to pay attention to what they do like the "feel" of.
-white board with markers that erase.
-pencils that are soft and pencils that look interesting and appealing.
-white out. I found the acquistion of white out produced a bout of writing in my child during which he happily wrote and whited out things he was unhappy with.
Like I say... one really has to grab and appreciate every opportunity that writing does happen.
More suggestions to come on this ....