In theory blue tooth keyboards should "just work"
I haven't tested an actual keyboard, but I have tested my BlueTooth controller in keyboard mode and that worked as keyboard (with about 8 keys :-))
If your keyboard has a button or control anywhere to put it in pairing mode, press that just before scanning for devices on the A600GS, make sure no other devices are grabbing the keyboard (eg my phone always grabs the bluetooth speaker I use if I don't disable it before using with the A600GS)