I think you're looking at this wrong.
I don't understand how cool would even work here. You've not described anything that would have the stakes for a cool move. You're not acting under fire. You're the FIRE. Do you want to grab a person? YOU GRAB THEM, this is AW we don't roll to hit. You think a grapple ends after you get a grip? No, that's where it STARTS.
EXAMPLE
NPC wants to break someone's face.
Player wants to stop them.
Player tries to grab ahold of the NPC, okay cool it happens. Player begs against the NPC fighting them off to listen, if NPC cares about the player's opinion, you've got leverage. Roll Hot. On miss, we've got the cross hairs, the NPC wants to the break the face more then they give a fuck about the player. Also, we've got a miss to snowball with.
OR
Player tries to grab ahold of the NPC, okay cool it happens. The Player doesn't want to beg, they want to FORCE them violently to the earth. NPCs and Characters in the apocalypse world don't s-harm for free, they get the harm they threaten to deal as a motivation. So this is not a 0-harm or s-harm, this is 1-harm fighting. 1-harm fighting probably isn't going to kill them. If the NPC isn't interested in killing the player, fine, but bashing you in the face with your own pipe to get you off and then into the door--maybe that's still fine. Is the player just going to let it happen or fight back too, how much does each side actually want what they want?
If you are willing to hurt but not kill the NPC to stop this. Seize by force, where the goal to prevent to the NPC from getting inside, this can be summed up nicely as defending a place.
I gotta say, if the PC doesn't want to hurt the NPC, and the NPC doesn't want to hurt the PC. Maybe grapple doesn't mean shit, maybe it happens, no one rolls, and you keep role-playing the scene right through.
OR
Player tries to grab ahold of the NPC, okay cool it happens. The Player puts the gun against the NPC's head and threatens to blow it off if they don't settle down. Hot is the player won't follow through, hard if they will.
OR
If I wanted to do cool, it would look more like this: You grab the tackle the NPC as they try to break into the home. While holding on them you scream for the guy to RUN AWAY. Let us assume he does and starts to flee. NPC now likes you a lot less, and they're going to fight you off and go kill that fucker. Roll cool to hold him down long enough.
10 + You do it.
7-9 You manage to give the NPC a head start but you got elbowed in the face when the NPC finally gets you off. 0-harm, roll harm move. Or any other halfway you did it! But you're not holding him anymore and the sitch is still rolling downhill.
Miss, You fail, you got gut /groin punched, then decked in the nose, through blurry vision and a shit load of pain you see the NPC catch his target, and then shoot him, stab him, or kick the ever-loving shit out of him, as per the fiction.
P.S. Going Aggro with 0-harm is LOL, and should be treated as such. It's a bad bluff, at best. So hard. Player clearly doesnt want whatever they're doing enough. That said, I've had go aggro rolled on blackmail, do this OR I"LL TELL! And thats works out fine.