There is only a very small risk of the franchise finding out if it is done, especially if it is infrequent. Besides that, “business risk” is not a halachicly sufficient barrior to ensure the reliability of the kashrus.
In a similar vein, there is a reason that halacha demands that even if a non-Jew simply DELIVERS meat or wine (that was fully prepared by Jews) it must be double-sealed since we don’t trust a non-Jew and suspect he may have changed the food to non-Kosher simply to spite the Jew. There he has even less incentive to switch it than in this scenario.