You being a NRI and your fiancee being an Indian, your marriage has to be solemnised and registered under the provisions of special marriage act only.
The countries like Germany insist on the solemnisatioon of marriage as per the customs including the marriage solemnised under sepcial marriage act and they don't consider the marriage certificate or just the joint photos of the couple as proof of marriage.
Hence registering the marriage without solemnisation of marriage as well as without you being physically present before the registrar for following the legal requirements of 30 days notice period and other formalities, the marriage will not be considered as legally valid and it may create problems for immigration when the truth emerges at a later stage, this may cause deportaion also for furnishing false information.
Better think it over properly and take a wise decision considering the future impacts too.