I read your question and I became interested in the possibilities of this combinantion. So I read some things on the website of Frient (Intelligent Keypad works with Homey) and seen the flows for this app and I only can come to the conclusion that you cannot use Homey as ‘compatible hub’ between the keypad and your door. The possible flows within Homey are only meant for things like to turn on your lights.
But I am no expert 
Edit: and after some more reading: you cannot change the state of the alarm from Homey. Only on the keypad itself.
Edit 2: also look at [APP][Pro&Cloud] Frient Zigbee App (v2.3.1) - #54 by Marc_Geer
Edit 3: possible future update: [APP][Pro&Cloud] Frient Zigbee App (v2.3.1) - #188 by frient
