How could Final Trawl ever be used as a halyard chantey? Not likely. It doesn't and couldn't fit anywhere in the scheme of traditional shipboard labor.
Rowing songs are used for rowing. Net hauling songs are used for hauling nets. Shanties by definition were used by deep water sailors which means merchant or whaling vessels and not fishing vessels. Shipboard labor was divided into two areas; heaving or hauling meaning pushing or pulling.