You can try using Handling unit management. Define a dummy material called 'kit' and use it as the packing material. The other materials (epoxies etc.) will be materials contained in the the Handling unit.
The expiry of each material can be tracked through batches of each of the materials in the HU.
The inventory movement will be using the HU 'Kit' so you can procure, issue and consume entire kits.
Handling Unit Management Within Logistics - Handling Unit Management (LO-HU) - SAP Library
Handling Unit Management - Handling Unit Management (LO-HU) - SAP Library