After a week's reflection, I decided that the white map pins were unbearably... white. Today my long suffering accomplace Ian came around and we pulled out the 350 pins we hammered in last Tuesday and replaced them with 350 pins I'd sprayed beige. We then put another 350 pins into the remaining 4 boards, which are substantially complete (they just need a bot of drybrushing on the vegetation).
This is the board with the new pins, which are much less obvious than the white ones. I'm very pleased with them! A big thanks to Ian for his help.