Hmm... I don't know about that, but I know other widgets exist that include bitcoin.de

2 examples:
https://play.google.com/store/apps/details?id=com.brentpanther.bitcoinwidget
https://play.google.com/store/apps/details?id=dh.android.btdechart

I hope you find a solution. I don't want to use 2 different widgets.
I am really happy with Litecoin Widget, except for the missing Bitcoin.de.