I think if you wire the A1000 KB correctly to a PS2/USB adapter that was design for an A2000 KB to work on a PC, it will work.
That being said here is a Arduino project that does that also.
http://forum.arduino.cc/index.php?topic=139358.0
Making an adaptor cable for the different Amiga keyboard connectors is pretty easy. Before I got my hands on an A1000 keyboard I made a cable that let me connect an A2000 or A4000 keyboard to either an A2000 or A1000.
I've also built the Arduino project linked above and have been using an A2000 keyboard with it at work for the last year. Much better than the garbage mushy keyboard that came with the PC. The only pain is that some of Visual Studio's debugger shortcuts use the F11 and F12 keys
