I am not aware of any workaround to this issue
The problem only applies to file names, which is not something a user of your app would normally see.
It should only affect files embeded in your code. Extra files downloaded at runtime should work wihether they have simple filenames or not
I realise it may be irritating to have to make the changes needed but, once done, it should not have any effect on the working or appearance of your app
If you have specific concerns about using different file names, please post them here and someone may be able to help or reassure you
If I were doing this I would make a copy of the original app in DroidScript using the "Copy" action from the main DroidScript menu, in case something went wrong
Then in the original code I would search and replace one file name in the code
Then I would rename the file or, if easier, copy it and delete the original
Then I would run the code in DroidScript to make sure it still works before moving on to do the next file