Here's a macro to duplicate source terms like Dokument-Variable to Dokumentvariable:
The same technique can be used to add forms with 'real Umlauts' to the source:
I'll try to update the macro to cater for this.
On second thought, I've decided to place the naked source term, without all dashes and further ado, at first position. Thinking ahead, with the future in mind...
Might be a wise decision, regarding sorting and splitting. The future will tell. Soon.