We are beyond this stage now, but one thing I heard of and never managed to track down was a telephone which you could put photos on the quick dial buttons, so that you just press the picture of the person and it dials them. When dad was in the early stages he had major problems with the phone, so that when he was home alone he could not ring us for a chat.
Also key tags with a biggish place to put a picture or words, but which are not too easy to remove Dad was always swapping the tags over, so that no key would open what it said it would. (He was trying to foil intruders, but more often foiled us !).