An apparatus includes a housing a platform, and a first buttress assembly. The housing defines a gap configured to receive a portion of an end effector of a surgical stapler. The housing includes proximal and distal portions. A portion of the platform is exposed within the gap defined by the housing. The platform includes proximal and distal portions. The first buttress assembly is positioned on at least the proximal portion of the platform. The first buttress assembly is exposed in the gap defined by the housing. At least one of the distal portion of the platform or the distal portion of the housing includes a cavity configured to receive a curved distal tip of the end effector.
