However the centroid triangulation option doesn't seems to help when using ngones export (.FBX). It looks like the internal triangulation (middle picture) can still produce this little nasty triangles.
Here's a first fix (Houdini) to 'correctly' triangulate those ngones. However I have to admit I have no clue what a 'centroid triangulation' is ... So I used the uv's as geometry position, triangulate it using a special "avoid small angle" in Houdini, and I restore the geometry position (while keeping vertex normals safe).