Good advice from jv...I've been through the exercise twice.... although not in Germany, it is was in another EU country/state. For what it's worth...selling a RHD vehicle in Europe will almost always end up in a considerable loss to you. If you decide to go down the selling route, do it in the UK and replace it with a LHD, preferably buying it in Germany. The paperwork, red tape and other hassles, not to mention the money angle...makes it a right pain in the bum!!
Speaking from experience, this is my two bobs worth.
PS. If you have read through the stuff contained in the link which jv kindly provided, then you will have an idea about the amount of phaffing about which is required....trust me, it's a lot worse where I live!!!