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How do you fix a situation where the box of exterior blinds is not flush with the interior wall?

We have installed exterior blinds with boxes in the window opening on most windows. Now the outside boxes for the louvers are not deep enough and are almost 20 cm from the inside wall. Now the plasterer has to plaster this.

The plasterer, on the other hand, said that the outer blind box should be doubled by 20 cm, so that it is more or less flush with the wall on the inside.

Now we are faced with the choice of doubling the lintels in the window openings by 20 cm with XPS or plastering the receding exterior boxes at no cost.

In my opinion, is this wrong, or should the exterior boxes for the shutters have been ordered with more depth so they are flush with the wall on the inside and ready to be plastered.....or?

Any ideas for another (cheaper) replacement? I have a hard time imagining it finished with 20 cm of plastered interior surface left over the window.

• exterior blinds