It seems to work fine now. I'm not sure what I was doing wrong before.
You can choose "composite font" and it shows the character
or you can choose "single font" and it shows.
And there's babelpad too, which has that and even has tools..character map and its character map goes beyond FFFF even to 10FFFD
babelmap goes that far too
here's babelpad's character map goes even to 10FFFD