Is distortion of a chimney flue possible?

Hello,
I hope my question is in the right place here.
In my old building, which is currently being completely renovated, there is a three-flue chimney located roughly in the middle.
Later, it will only be needed for the fireplace in the living room and can therefore be single-flue. The chimney sweep has also given his approval for this.

For various reasons (floor plan & statics), the middle flue will be used on the ground floor. There was a long discussion with the structural engineer about being able to widely open a wall breakthrough adjacent to the chimney; the first flue will be filled in.

On the upper floor, it would generally be better for the floor plan to have the position of the first flue again in order to allow a somewhat wider passage.
According to the building supervisor, he has already seen that the flue can be offset, i.e., not go straight up. The chimney sweep was not very enthusiastic about this and muttered something about cleaning and draft performance, but he did not reject it. The stove fitter also said that theoretically it might be possible but he didn’t really like it either.
As I said, we are talking about about 25 cm offset; since I am having the chimney rebuilt on the upper floor anyway, I can also determine the angle etc. Does anyone have experience with this? Does it really make things that complicated?


The white column that reaches into the sky is the chimney. I would prefer pushing it into the room and having a wider passage instead.

Can you upload the floor plan? In 3D, many things are not explained to you. The problem is that you have to generate the 25cm offset over a short distance, namely the [Zwischendecke].

We had the same problem and wanted to switch between the flues in order to install an additional window. Our chimney sweep rejected this at the time. However, I no longer know on what basis. Cleaning played a role, as did the fact that the draft performance would probably be too greatly reduced.

I have now decided against it as well. Even though I would have liked to get rid of the small wall protrusion in the hallway, it seems to bring many potential problems later on.