BIG success! I just managed to get the workflows out in oData.
I managed to use transaction SWDD myself to locate the correct IDs. I had gotton the step id wrong in the first place. Then it worked so big smiles here 
I still think the documentation is a bit wrong in stating that it isn't neccessary to maintain task names and decistion options when filter isn't enabled but maybe I'm still misunderstanding something there?
Anyway if you have some points regarding consuming workflows in one gw hub service from many sap backend sources (as mentioned in my reply before) I'll be happy to know 
Thanks again - Jan