[xep-support] German hyphens for addition

[Keith Strong]

I've run every test I can think of to resolve this instance, but am 
unable to come up with a solution.
In the German language there are terms which can be written with 
multiple preceding atoms and one common succeeding atom.
The prefixes are separated by a hyphen followed by a forward slash. For 
arguments sake we will use the example Luft-/Ölfilter (Air/Oil filter).
Now if this needs to break when rendering it will automatically break 
after the hyphen instead of after the slash.
My question is how would I get this to break after the slash.
I've exhausted all the combinations using non-breaking hyphens, 
zero-width joiners, etc.
I've investigated modifying the hyphenation library but have been 
unsuccessful in finding the solution.
If anyone could help it would be greatly appreciated.

Thank you.

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