Your best bet would be to cut your gas line and install a T and a second gas disconnect.
Can you get the kegs in a refrigerator? If so, you can probably swap the gas to the other keg every few hours and get them carbed in 10 days. For example, switch it when leaving for work, when you get home, and before you go to bed.
Walmart is about the only reason for open or concealed carry that I can get behind. -Randar