Migrate from Sonoff ZBDongle-P to ZBT-2 in Zigbee2MQTT

The Sonoff runs on zstack and the ZBT-2 on ember. I've tried serveral migration guides, though many are very similar. After hours i've given up and restored my backup. I'm now running on the old dongle again. Did someone perhaps migrate from the same device and managed to do it? I really want to avoid pairing all devices again.