I think healing would be a bit boring but maybe.
After the 1-3-2 card, I wrote up a version that I think would thematically fit hog and make the aoe feel less tacked on. Roadhog: Take a Breather but in reverse
Gist of it though is that Hog’s janky breathing device naturally leaks out a damage resist cloud for nearby allies when “Take a breather” is available.
Hog can selfishly use Take a Breather to the same effect as he does currently but doing so will remove the aoe until the ability is back off cooldown.
In that Scenario, Hog “accidentally” helps his team and we end up with a creative way to handle another aoe in this game instead of just giving Hog permanent aoe resist (or heal) like Lucio. Hog can consider whether using his heal to resist incoming damage is worth more than the passive resist he is providing his teammate and the enemy can focus Hog to force him to stop supporting his team or time their pushes when it is on cooldown.