the A.F.R. player-substitution ruse

Operational disguise at the organizational scale: the A.F.R. will intercept the Québec junior tennis team en route and "allow A.F.R.s to arrive at the place in their stead" — bearded, wheelchaired assassins passing as children tennis players, needing only "an excellent ruse to explain the wheelchairs and adult beards of the false players." It is the impersonation-and-substitution that surfaces in 183 as the "Special-Olympicish" contingent nobody quite believes; here it's stated as method. (The road-mirror gambit that delivers them — "An old F.L.Q. trick" — is nationalism-onan's political material, routed there; taken here only as the op's disguise-substitution component.)