But I think to enter a position more quickly : using FEN notation for exemple.
Add a special key to request FEN notation, then simulate input via buttons and chessboard, or better simulate the SETUP key, the LEVEL key (to remove all pieces and make other things), write the position directly to memory, then simulate the TAKE BACK key.
Of course, analysis of FEN notation and internal coding of the chessboard for each chess computers are necessary, but simple ;-)