This is generic blueprint that exposes the functions of IKEA STRYBAR E2001/E2002 remote specifically for use with Zigbee2MQTT after the 2.0.0 update. Other base functions are exposed for your automating delight.
It is a lightly adapted version of the blueprint shared here: Zigbee2MQTT 2.0 IKEA TRADFRI 5-Button Remote Actions which uses the device as opposed to the entity.
What is currently absent is the release on the bottom light button which delivers the same package as the top light button when released.
Source code available here: Zigbee2MQTT 2.0.0 IKEA STRYBAR 4 Button Remote Actions.yaml