So after bit of instructions from Chips and following couple YT videos, I was able to implement this on my RPi and now keyboard works correctly!!
I've tested few more games last night and everything works great.
As I tested WHDLoad, haven't need much to change floppy disks. It would be nice if this combination form WinUAE exists: END+ F1 - F4 - change disks df0 - df3 and if SHIFT+END+F1 - F4 - removes floppy from disk unit.