I'd be a little leery of swapping a single-bike spec fork onto a tandem, especially one with a 1" steer tube. My other feeling is that north roads on a bike that's already small for you would leave you pretty cramped -- moustache bars would work better and you could save the existing brake levers.

The regular technomic is a good way to go--you can get up to a 130mm forward extension and they're $45-60 if you shop online.