Hi CaptTom,
I wish you had a brilliant Christmas! 
We’ve been working hard on the HS1SA-EF integrations for ZHA and Zigbee2MQTT, And I updated with another post, as development is almost complete. Could you take a look and see if this suits your needs?
Heiman smoke alarm HS1SA-EF-2nd new features in ZHA and Z2M - Home Assistant Community