Which devices use UC-E6 plug
I haven't heard of an adapter but you could consider snipping the lead and attaching to something else. Micro USB connectors themselves can be a bit tricky to solder but maybe you have a surplus cable sitting around and you can splice / solder the wires together? 

The following photo taken from Splicing DataBus cables for exterior weatherproof deployment illustrates. That same page also goes into additional detail about achieving a professional result. You may want to invest in some heatshrink tubing but alternatively electrical tape could be used for a "less neat" solution to insulate the wires.