Path of least resistance is only an issue in games when the players see obtaining the reward for some activity as more desirable than actually doing the activity. If players are doing so in troves, it's a clear signal that the activity they are avoiding is either just not fun, or else it's already overrewarding. Or both.
Games are about providing joy to the people. And players instinctively know it. Any time devs try to make players do things they don't enjoy in a game, be it by forcing the players or by providing too tempting rewards, trouble arises.
And, BTW, unwanted player conflict falls into the non-enjoyable category for a very large number of players.
Rewards can never fix it. The only workable fix is to actually make both running escort and having escorts fun activities.
Otherwise, players will find ways to cheese out the rewards regardless of any restrictions the devs attempt to add.