'Wrap/flex' a sketch around multi-faced body

Hi all, am having some trouble with some detailling on my design. I have been searching for a solution, but cannot find anything about the specific situation which will work.

This is the case: I want to create a wavy pattern across multiple faces. In essence there are three main faces which are filleted together. 'Wrap' won't allow this since they are not all tangent to the sketch plane. Projecting the sketch is also out of option because I want to have maximum control over the dimensions.

How to achieve this? In an ideal situation I want to actually flex the sketch plane using an intersection line, but I don't know how to do this or work around it. The sketch is supposed to be extruded with a height of 2mm. An image of the situation and sketch is attached.

Thanks in advance!

SolidworksParts And Features