Window mounting options for wooden blinds?

Good evening everyone,

a somewhat different question, which hopefully still somehow fits into this forum: I have these beautiful wooden blinds. Unfortunately, I realized too late that they can only be mounted on the wall (which is not possible for various reasons). Because the headrail is almost 6cm wide, I have so far not found any clamp brackets to attach the blinds to the windows. Now my question: Does anyone know of clamp brackets for 6cm headrails or does anyone have another suggestion on how I could attach the blinds to the window?

Thanks in advance and enjoy the evening and the weekend!

In the picture, the head profile is only moderately visible, but it looks as if it has been bent inward by 180° on both long sides. If you now insert a block with the appropriate width there, you can attach everything else to it. This block could be sawed and filed from wood, or 3D printed if available.