[NTG-context] Upright greek with Fourier

Hi, I'm using the Fourier Utopia Fonts together with the latest stable i-Installer ConTeXt package. I'd like to access Fourier's upright greek alphabet, especially the large omega. However, the font including that character doesn't seem to be used in math-fou.tex. I tried all characters of mi (standard math) as well as many characters of sy and the ex one (using \definemathsymbol [otheromega] [ord] [...] [...]). I guess I'd have to define a font synonym pointing to the right font file, but my attempts didn't produce anything but garbage. At the moment I'm using \getglyph{fourier-ml}{173}, which is stupid but functional. So, can anyone help? Thanks in advance, Sebastian