If you can't find a fork that satisfies, you can try to find a suspension stem. The ones I know of aren't made anymore, but they show up on ebay pretty frequently.

Softride Stem
http://shop.ebay.com/items/_W0QQ_nkw...fromZR8QQ_mdoZ

Girvin Flexstem
http://shop.ebay.com/items/_W0QQ_nkw...fromZR8QQ_mdoZ