Wendy is right that skipping is the safest thing to do.
Here's an idea:
You mentioned giving high carb food at +8. By then, technically, the Lantus should be subsiding. Could you give the high carb food now rather than wait until +8? He doesn't look like he plans on coming up on his own. What do you think?
You need a two hour window of rising numbers after the low number event to really feel he is safe. If you gave HC food now, help him rise above 50, monitor until +8 to make sure he is still rising, then give some MC when you leave to hold him over until you get back.
Problem is the HC food followed by the MC food might still cause him to bounce, and possibly more than if you just skipped so I really don't know. What are you thinking?