Yes it is/was possible. However while it does work the Jeep will now need a new transfer case because of it & that switch & wiring should be removed & never used again.
any way to test that? if the transfer case is fried.You don't need to take out the driveshaft, but you do need to remove the transfer case motor. I agree with Jim that the TC is probably fried if the owner used this "switch" a lot.