Yes, this a perfectly good species to use. I use them for handling demos at schools and at shows.
Emperors are more likely to pinch (you do not want to get pinched-adults can do damage) than sting. There is always the risk of getting stung or pinched.
The other issue is the scorpion being dropped-regardless of age. if they do sting, it is pretty mild venom however, there can be reactions to the venom.
I rarely have had an issue but I recommend buying from a breeder (captive bred species) and not a pet store.
I have handled emperors from different breeders and I have only been lightly pinched once and it was a "I am done being handled" pinch.
Keep in mind that Emperors require humidity so you will need to mist their enclosure often.