This might sounds too low-tech (and can't be patented), but simple nasal irrigation with a lukewarm isotonic saline solution works pretty well for me in this department.
In terms of building habits and routines, I think the trouble with nasal irrigation is that it takes too much work to prep the water. I do it during allergy season, but only because my hay fever is bad enough that the relief is a big help. If you want people to make a habit out of it in the absence of having their sinuses assaulted by trees, it would be good if there was a way to have water for your neti pot as easily available as toothpaste is.
You'd need a gizmo that can quickly and easily take an adequate quantity of water, sanitize it, bring it to temperature, and add the appropriate quantity of salt to make it isotonic without too much effort on the part of the user.
1) Eat a chili pepper. As hot as you can handle. The point is to get you perspiring and salivating. Will completely drain your sinuses in the next 5 mins.
2) Aerobic exercise or a run for 10 mins.
3) Inhaling steam.