It seems ldpower plans to organize a group-order of bonkas for germany, they are listed as official retailer for bonka battery packs for germany.
I wrote to gerd AT ldpower.de
Hi, I resigned myself to use non-bonka batts, and they do work well. I chose 6s because it was easyer to find a charger at the time, and it still all runs.
There is a topic on that on the forum already (166usd/6s battery was the price I payd, delivered from China. I could not find a single French retailer in my area willing to sell me those kind of batteries. )
Have nice flights!
I would see if you can just get the housing or the specs(dimensions) 1st of the housing and than see if someone there can make a battery pack for you to fit in it.
I cant imagine not taking advantage of the form factor these guys have put together.
Prost