Euro L is a great oil and won't shear. The HTFS of M1 EP 0W-20 and 5W-30 are the same at 2.0. HTFS stands for High-Temperature Full Shear.30 grade oil is considered resource conserving too and is hardly any thicker than 20 weight but a bump in hths helps in the high ambient temps for sure. id run pennzoil platinum 5w-30 in it without being scared, probably euro L its a great oil. And yes outside of the US that engine can run a 30. besides a cold morning 0w-20 is still many times thicker than a 30 grade at operating temp. engine is smooth and quiet until the oil thins.
So you're absolutely right, however, 5W-30 gives you a bit more room for hot temperatures.