(Fake French accent) I 'ave received un reply avec le climb du haute montagne en New Caledonia:
there are 4 places for climbing here. 1 small (10MTRS high) in noumea, a
large one in tontouta (near airport), 2 others at koumac (north of NC)
Here below is the web page (in french!!!) of clubs in NC
On my side, I am at the GECKO CLUB who does organize indoor training on
tuesday and thursday evening. During school holidays, they will closed
these sessions from mid december to mid february.