Now my attempts so far are stymied by this weird half world. Most government contracts basically want either bums on seats contractors or to fundamentally hire "someone who has done it before" (effectively the same as wanting to buy off the shelf)
So there is almost no way to seed fund the initial OSS development.
Down thread people talk about a fund for starting OSS projects to provide things like this. Plover is an example of people trying it on their own - but a funded system that basically follows current gov work seems better.