Take a look at the Berwin Backcountry bindings which will fit many boot types. They will not be as efficient as purpose specific boots and bindings but might do the job.

There are lots of potential ski's. Look for something with a metal edge and a reasonable width to give you some flotation but nothing too wide as your packboots will not offer a lot of control.

A few people have recommended the Asnes Combi ski's in combination with the Berwins but there are similar skis available from other manufacturers.

http://www.asnes-ski.no/eng%20index.htm