Sans serif upright lower-case Greek letters for beamer class

Question

I use the beamer class with the cmbright package which provides sans serif Greek and Latin letters for the math mode and also sans serif-ish versions of math symbols such as \partial. Unfortunately, it does not seem to provide upright versions of the lower-case Greek letters. I know the upgreek package, but the letters it provides have a serif-ish look about them which does not combine nicely with cmbright.

Here is what I mean:

\documentclass{beamer}

\usepackage{cmbright}
\usepackage[Euler]{upgreek}

\begin{document}
\begin{frame}
$\alpha\beta\gamma\delta\epsilon\varepsilon\zeta\eta
\theta\vartheta\iota\kappa\lambda\mu\nu\xi\pi\varpi
\rho\sigma\tau\upsilon\phi\varphi\chi\psi\omega$\\
$\upalpha\upbeta\upgamma\updelta\upepsilon\upvarepsilon\upzeta\upeta
\uptheta\upvartheta\upiota\upkappa\uplambda\upmu\upnu\upxi\uppi\upvarpi
\uprho\upsigma\uptau\upupsilon\upphi\upvarphi\upchi\uppsi\upomega$
\end{frame}
\end{document}

Maybe someone knows a solution? Ideally, there should also be a way to get a bold version of the letters. Thanks a lot!