Welcome to the forum tfiedlich,
Yup the Wyane-Dalton WDHA-12R is a Homelink receiver. You can send it commands with your Homelink garage door buttons. IE: I have the Homelink devices in my vehicles. They all have 3 buttons.
The device is also a Z-Wave transmitter such that you can program it to receive your garage door button Homelink signal and transmit a Z-Wave signal; say to your garage lights or similar.
I do not know that you can set up a sub controller today with the Almond +. That said I do not think you could pair up the device with the Almond +.
The Homelink unit needs to be trained by programming it with a signal sent by a regular 310MHz X10 RF remote like the HR12A.
The Homelink unit measures the frequency and duration of the pulses, saves the data to memory, and then sends the pulses at the required frequency when you want to control X10 lights and appliances.