Sorry for the double post.
So, as I said, using the label file worked.
Then, today I also worked on the valve timing. There's only one timing mark on the flywheel, and I manually determined its position.
So, I brought the camshaft to the TDC (Top Dead Center) position, and this time, I was very precise. I didn't have a feeler gauge available, but I used razor blades instead, and it worked wonderfully

. It took a little tinkering, but it worked.
After that, the crankshaft position sensor (ESP) was disconnected, and the top dead center (TDC) was manually determined, revealing that only one camshaft had the notch. Subsequently, the crankshaft was aligned, the timing belt was placed and tensioned, and the TDC markings now align correctly.
Okay, I started it, but the blue smoke is still there.
I mean something a little less, but still quite a bit.
Whether it's warm or cold, I've also done a smell test, but I'm a bit unsure. Based on the smell coming from the air intake, I would say the engine is burning oil.