Prototyping a part with 2mm spacing on 0.1" matrix board?
The best way would be the adapter. 

A quick way would be to take a dremel tool to the 
Vector board and route a slot. Epoxy the 2mm sockets to the
board and then run jumper wires to Vector K24A pins.

If you do not have many pins you could take a wire-wrap header
with 0.1" centers and bend the leads on one end to 2mm centers.
Solder the socket to bent leads.