Remotec zfm-80 - timer-off

Hey everyone - so I’m actually using the Remotec ZFM-80 as a button to release the front gate - thought being that we can remotely unlock the gate when someone rings the doorbell and we verify them through the front yard Ring camera. I’m trying to figure out a way to do one of two things, a) configure the device handler to only put the switch to ON for 5 seconds any time it’s activated, or b) set a Scene called “Activate Button” which will turn on, wait 5 seconds, then turn off. The OEM handler for the device only has an on/off, though it does have a Timer - problem is I can’t figure out how to set that timer from a Scene.

Any thoughts on a way around this or do I basically just need to get someone to create custom code for this?