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I am not 100% sure I completely understood what you intent to do, but I think your basic intent is to subscribe to a message of which you do not know the type (at least at compile time, maybe in your lib-part even not at runtime). If so maybe it'd be of interest for you how this is done in topic_tools/throttle:
https://github.com/ros/ros_comm/blob/indigo-devel/tools/topic_tools/src/throttle.cpp
There a message is subscribed (and republished) without knowing its type. This is achieved by a class called ShapeShifter that exposes type getter / md5sum getter etc. for an arbitrary message type:
https://github.com/ros/ros_comm/blob/indigo-devel/tools/topic_tools/include/topic_tools/shape_shifter.h
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