Yeah this would be very nice if you could make a tool with Java. 
OK, I'll do so this afternoon. No cost to you, will provide both runnable JAR and source code. Command-line OK or do you prefer a graphical interface?
A graphical interface where I can easily paste the addresses would be nice.
But if it would be possile to import just a text file via command line this would be also okay.
Done. It allows both pasting and import of a text file, and has a GUI. Please let me know if you need any export/summary feature added.
Source (Java+Maven+IntelliJ IDEA)
Runnable JAR
Source code is made available in the top link and should compile as-is with IDEA. Bottom link is runnable JAR, compiled with Maven as a jar containing dependencies (see pom.xml in source for more details). It should just run on double-click or with a command line (java -jar /path/to/jar)
An export function would also be nice and is it possible to add a counter where you can see the total balance of all added addresses together added up?
Thank you,
Patrick
OK, I'll do those momentarily.