Yes. I could use the French Roots sticker as a basis - I'd want a language switch for English, French, Flemish and even German (the three last being all official languages).
The main difficulty with Belgium is its very specific history - it only exists as an independant country since 1830, and before that it was Dutch (1815-1830), French (1795-1815), and even before it was split between the German Holy Roman Empire and the Austrian Netherlands. Hard to take all this into account, but we'll start by not worrying about that !