Rotate raster (asc) by degree in QGIS

my plugin creates an ASC file that I can load in QGIS as raster.

Sometimes I need to load the raster with an additional rotation.

The only solution I can think is to warp the raster by a custom CRS with an additional rotation.

Is there another smartest way?

EDIT This is the numpy array that I have. Actually the asc file comes from this array, so all the transformations will be performed on this object.

The code below does not work with this dataset:

import numpy as np
data = np.array([[ 40.,  40.,  40.,  40.,  40.,  40.,  40.],
[ 36.,  36.,  36.,  36.,  36.,  36.,  36.],
[ 32.,  32.,  32.,  32.,  32.,  32.,  32.],
[ 28.,  28.,  28.,  28.,  28.,  28.,  28.],
[ 24.,  24.,  24.,  24.,  24.,  24.,  24.],
[ 20.,  20.,  20.,  20.,  20.,  20.,  20.]])