If I could adapt a hose to what I had I would not drill an additional hole. Just me.
I have the mounted gas post on some of my larger fermenters, but a drilled bung and gas line from keg post to fermenter blow hole (inserting the line into the bung there) works well, too.
I use gravity to drain through the QD out post and pop the PRV. It’s a slow transfer from my plastic big mouth bubbler. Only issue I’ve hand is clogging the post with hop gunk