Beamer frametitle always uppercase for text but not for href or url

I have a \citebutton command that I often use in the frametitle to link to some sources. Furthermore, I want to force the frametitle to be always in uppercase.

Unfortunately, I am not happy with my current solution which is:

\documentclass{beamer}\setbeamertemplate{frametitle}{\expandafter\uppercase\expandafter\insertframetitle}\newcommand{\citebutton}[2]{%\resizebox{!}{9pt}{\beamergotobutton{\href{#2}{#1}}}%}\begin{document}\begin{frame}\frametitle{Title should be always uppercase \citebutton{arXiv}{https://arxiv.org/abs/1703.04730}}\end{frame}\end{document}

Problem: The URL itself and the text of the link inside the citebutton (here: "arXiv") will be uppercase as well. I want that my \citebutton command is not affected by the uppercase at all, e.g., I am looking for something like a \stopUppercase that I could use before the \resizebox command inside the \citebutton command.

Using \lowercase inside the \citebutton at least makes everything lowercase but does not solve problem as I would like to "deactivate" the uppercase for the \href command

\newcommand{\citebutton}[2]{%\resizebox{!}{9pt}{\beamergotobutton{\lowercase{\href{#2}{#1}}}}%}

Any ideas how to modify either the frametitle or \citebutton command so that I get what I want?