Basically you can kill cgminer process and then start manually another cgminer process with your arguments according to this post
https://bitcointalk.org/index.php?topic=486808.msg5417609#msg5417609, then you will see cgminer output.
If you add all command parameters as seen in /mineros/boot.py then web interface works after restart of cgminer:
cgminer -- --text-only --lowmem --bitmine-a1-options '+a1_options+' -o '+row[1]+' -O '+row[2]+':'+row[3]+' -o '+row[4]+' -O '+row[5]+':'+row[6]+' -o '+row[7]+' -O '+row[8]+':'+row[9]+' '+row[10]+' --api-allow '+row[12]+' --api-listen --queue 50 '+row[13]
Substitute row[number] with value from corresponding row on the miner settings page in web interface.