The problem, @DarkLiquidus, is that your idea is quite unique and we don’t have anything that will support it out of the box. The best fit from what I see would be making characters navigation obstacles. I remember I discouraged you from using it, but in your specific case you don’t have much of a choice.
In another thread you mentioned navmesh is not generating fast enough - try tweaking navmesh generation properties towards best runtime navmesh generation performance. There should be enough data on the internet on the topic, or look at this video where I talk about this, but in short keep your tile size as small as possible and voxels (cell size and height) as big as possible.