Yeah. That would work. You'd have to make sure all of the programs behaved and would close the fifo when it's not needed. I'm also not sure how you'd know that somebody else is reading the fifo.
The problem with the fifo is that you'd need to make sure that the fifo is being read at the same or faster rate than it's being written to by the gps daemon. Otherwise you're going to end up with stale data. *shrug*
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