You can run one of these bar end shifters by J-tech (From On-One) with Alfine /Nexus 8 speed hubs and drop bars. This so should/might work with Rolhoff.
There have been rumours flying around for a while now that some hydraulic compatible drop bar brake levers will be coming out, so you might be able to ditch the flats some time in the not to distant future.
You can run one of these bar end shifters by J-tech (From On-One) with Alfine /Nexus 8 speed hubs and drop bars. This so should/might work with Rolhoff.
http://www.on-one-shop.co.uk/acatalog/copy_of_Alfine.html
There have been rumours flying around for a while now that some hydraulic compatible drop bar brake levers will be coming out, so you might be able to ditch the flats some time in the not to distant future.