I'm no lawyer, but I don't think it's possible to grant a conditional legal equivalent of "prior restraint."
If Cankles and the First Rapist are not indicted or impeached and found guilty before Omugabe's term of office is over, no pardon can be granted.
I really hope that there are some GOPE with more than a few brain cells in D.C.
Did not President Gerald Ford pardon Richard Nixon, though no charges had been brouht against him?