But a few months ago, I was browsing some of the sites that have nifty products for people with special needs and discovered that there is a successor to Writing With Symbols: Communicate: SymWriter. At the time, there was a trial available, but only for people in the UK.
However, the lovely folks at Mayer Johnson now have a trial available for folks in the US. I think the nicest feature, if it works, will be the intelligent symbol use (i.e., it can tell the difference between "drink" the noun and "drink" the verb, and uses the appropriate symbol in the appropriate place).
I cannot afford this. I know the district can't.