@buzzle 

Hi,

Finding a compatible charger with a 3m long cable might be difficult. Actually, I myself have never seen a DC power adapter of the type that has its mains power plug directly attached to the brick that came with such a long cable.

I think more viable solutions would be to either purchase a 3m long 230V/115V AC extension power cord or power strip, which should be available at any larger super market or electronics store near you, or, if you feel that looks too unesthetic, order an USB Type-C male to USB Type-C female extension cable from some online store that you should be able to find via a Google search.