Not quite 2mm (but I did other periods in 2mm) but I did some WW2 stuff in 3mm (1/600th) and used the fine wire from an old cable as the wire – just coiled around a barbeque skewer. I didn’t bother with posts, just a few drops of superglue on the base along the line of the wire and hold the wire down for a few seconds until it sets enough to hold.
I know early WW1 wire was not laid in rolls line that but, if you want the linear entanglements you can drill the base and put in florist’s wire a few mm apart and then entangle the wires randomly through the maze of posts, trimming off any post that are too long afterwards. Fiddly but it works OK in 6mm.
Tony of TTT