CDO

I have a CORDEX data file: tas_EUR-11_MPI-M-MPI-ESM-LR_historical_r1i1p1_SMHI-RCA4_v1a_3hr_197501010000-197512312100.nc (the first timestep for the variable tas of this data is attached).

All CORDEX files seem to have 2 coordinate systems: the rotated pole coordinate system, which is linear and presented by the 1D rlon/rlat coordinate variables and the second one being 2D lon/lat coordinates, which are curvilinear and present “usual” geographical coordinates (compare sinfo.png and ncdump.png).

Tbh this already confuses my a lot...

I want to remap/convert to a somewhat "regular" coordinate systeme, e.g. lonlat, to be able to import my netCDF file as a raster layer to QGIS. But QGIS does not like curvilinear grids... I have already looked through the help pages here and tried the operators setgridtype and remapbil.
In the case of setgridtype,lonlat it got me the ERROR message: cdo setgridtype (Abort): Unsupported grid type!
And for remapbil,r360x180 the result looked not at all what I need it to be. But this makes sense, since I only have coordinates for Europe and not the whole world.

What I am trying to do is to import the netCDF file to QGIS to join it with a population grid from GEOSTAT (https://ec.europa.eu/eurostat/web/gisco/geodata/reference-data/population-distribution-demography/geostat) containing population data on a 1x1 km raster, which is in .csv format. Maybe there is another way to do so with CDO?? I am open for suggestion!

Really any help is much appreciated!!

I am using CDO version 1.9.3.