It seems as though this adapter might work http://www.dealextreme.com/details.dx/sku.7199
It's a right-angle adapter for the N70, which I think is the same power plug as the N800.
From the picture, it's to connect the N70 to an earlier-model Nokia (larger barrel coax) charger - but I'm just guessing.
I'd just order one to see, but they're OOS
Bob

PS: I could have this exactly backwards as it's possible the N70's the earlier model and uses the larger barrel - to it'd be for using a newer charger with the older phone.