Making matters worse is the fact the Grail comes fitted (depending on size) with one stem length and one bar width. There’s no option for changing it during the ordering process, and buying a replacement would be costly.
Canyon has known this from the outset, so the sizes were chosen to fit a “standard” body shape and size. The medium Grail I rode came with a 440mm-wide bar and a relative stem length of 75mm, but if you fall anywhere outside of “standard”, you’re basically stuck