I've tried a bunch of cheap remotes. The single button (or Android/Apple two button) ones usually don't do anything useful. Some of them do Enter.
Ok, I know that this part is not useful for most people. In the past, when selfie clickers were not so popular many of them used a masked ROM for the Bluetooth stack and an EEPROM for the OEM's code. Finding and altering the USB HID descriptor was easy. Then you could have the clicker generate any key code. You just needed an I²C interface to reprogram. I did this to one clicker and then put it into a little foot switch. Since then I've just replaced it with my own Bluetooth circuit.
The other way is to make a custom /system/usr/keylayout/Vendor_1234_Product_5678.kl that will remap your useless button to what you want. This will work fine, but it means that you can't use your clicker on a random device.
There are clickers with "5 way" controls, but I've found the mechanical properties ungainly.
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Originally Posted by esteban2023
I've checked with evtest and it is generating a KEY_VOLUMEUP event.
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It sounds like the keylayout is the way to go for you?