Change monitor mode commands

How/Where should I change the commands to place one external wireless card into monitor mode?

My card needs the following to work on monitor mode:

ip link set wlan1 down
iw dev wlan1 set type monitor
ip link set wlan1 up

Unfortunately, the standard commands issued by pwnagotch/bettercap doesn’t work for my card (ALFA AWUS1900).

Where shall I edit the settings to change these?