good choice with the LC food. It's great that he is eating, that it really important while he is in the recovery from the DKA.
I think you would be OK to leave him be, feed him his LC as you would normally do (nothing after +10 though) and then grab a +11. Unless of course Salem tells you something is up by acting strange.
If you want to test more then that's fine too. But think you could grab a break now, let you get caught up with the house work LOL
They're great, George (BFG) snuggling beside me, and the others are lounging in front of the fire, they're all happy now they've had their dinner.