Midwest Industries just released their own KeyMod compatible, plastic hand guard covers. I have used their similar covers that they designed for use with their SS Gen-2 Hand Guards and they are excellent.
The best news is that these panels use mechanical hardware. The current plastic hand guard covers that are available snap in place and can be a pain to install and they come loose over time. The new MI panels should be much easier to deal with though perhaps just a bit heavier.
These will be offered as sets initially. One set will include 3 regular panels. The other set will include two regular panels and a panel with an integral handstop. They may be offered individually at a later date.