Hi Liz, there is an obvious need for something like Khub. Word has spread and people have signed up. However, the groups I have observed seem to suffer from a lack of engagement. I have been trying to find a khub functionality recommendations / support group, but I don't think one exists so apologies for writing comments on your blog post.
Police forces are very tech limited. For example, a simple blog on an intranet seems to be too much to ask. Part of my role involves Horizon Scanning, i.e. looking for PESTELO type issues that need to be factored into policing strategy. This is something that many forces do independently, when it should be done collaboratively.
I think this is where khub could really flourish as you could join police forces together with functionality they cannot provide themselves. However, I'm not sure that khub can quite fulfil this requirement, which would limit your engagement. For example, there are no tags or categories visible on a blog page. Also, have you considered IFTTT or MS Flow integrations?
A Wiki is a great way to share good practice, lessons learned and all sorts or organisational knowledge, however navigating to, and finding content is quite difficult. Without being able to easily create a structure, the Wiki ends up being a disjointed list of outdated items.
In top level meetings, Khub is referenced as a solution to some of our problems. At the moment I don't see that happening, but I would like to.