Thanks for the suggestions so far. I do have a pin-spanner for a watch kit, but I doubt I can get enough torque with that. And with all the seized parts, I'm pretty certain I'll damage the pins on a lightweight spanner.

I'm not that familiar with all the different BB threadings. Which way is the adjustment cup supposed to be turned to remove it for French, English, Italian, Swiss, etc.? Which way for the removal of the fixed cup?

Granted, I have no clue what threading this might be. I can take a look at the threads when I'm back with the frame (away for Labor Day weekend), though I do recall seeing "Tange" on the cups if that's of any help. If my attempts fail with my limited tools, I believe I can rent bike work space for $8/hr (QuadBikes). They should have a spanner of adequate size. But the harbor freight pin wrench seems decent. Does anyone know if the pins actually fit or if they are replaceable?