I just stumbled over an ebay auction for an Ultranav keyboard. Auction
Seemingly he sold one in better condition for 22 € before... link
It's USB, shiny, ANSI and no winkeys, but maybe you can use it for spares to resurrect yours. Don't know how those look inside though.
Regarding the Keysonic ones:
I once bought one of those (540BT) for the HTPC but never used it, they're 29x20cm, cheaply build, stupid layout for typing, and the Touchpad buttons seem to have no actuation point at all. Plus I don't dig those soft touch plastic surefaces at all.