They might do ok physically. They seem to go to the gym daily, do 5 mile runs quite often, and I presume they are constantly dance training, so should have decent stamina.
I can see their biggest issue being the mind games/being shouted at. I know when AJ did Celebrity Hunted, both him & Curtis didn't react well to the hunters doing a little bit of psychological teasing.
I think Amber Gill might be doing it as well, as she was previously rumoured as taking part in the new series...and has been silent on instagram/twitter for a few days (unless she's in hiding for I'm a Celeb). Plus, her agency has combined with the one who manage AJ & Curtis (so they might do a group booking
).