I have no idea how to set 1250 on the MCP
so I would climb to 2700 and turn at 5 DME.
If you are not sure,and worried about the traffic joining from the north at 3000 ft ,request clarification from ATC.
If you are too proud to ask over the radio,just go and see them,free coffee I reckon.
I was just looking at Kanak 2 A departure, 10-3M, and was wondering how the designers expect pilots to join a radial 160 deg off the apparent inbound track...