I am pretty certain the real answer is "no". Vegetable oils like that will break down over a very short period of time. They will become rancid and who knows what will find a home in it.
Keg lube is a petroleum gel (think food grade Vasoline). It will take a much longer time to degrade, I don't think it will go rancid and not much is going to find it an inviting place to live.
If I really, really, really had to substitute I would consider Vasoline. But it would be an emergency thing and I would get some keg lube just as quickly as possible.