I say, to do it, do it.  If you don't do it, you can't.  I totally just did it, as a player, and it wasn't a problem.  I rolled a 10+, so no problem.   On a 7-9, I would have suggested taking weak but healing the HP as I spread my wounds out across my body and soul.  Don't ask, just narrate something cool.

For example, here's what I said:
"My head swimming from the harsh blow of the tentacle and subsequent contact with the unnatural stone altar, I black out momentarily. In my haze, I see my lord's face, his sword cold against my neck, as I kneel and recite the vows of the order. "...to serve and honor. To protect and sustain..." Just as suddenly, the squishy cacauphany pulls me back toward consciousness. Rubbing the salt water from my face, I feel a little better and I know what needs be done."

There used to be a good example of play on the Something Awful forum (The Sky Chain) but its old enough now that you need to be a member to access the archived threads.  I'd have saved a copy if I'd known they were only up 6 months.

There was some similar discussion here.

Given the results, I'd be tempted to douse the lights for the chance to get a free torch or discover some hidden item or 'feature.'    Eaten by a grue sort of steps on the GM's toes by saying what a monster/NPC does. 

I'd make them each roll seperately and give XP to any that failed.  I mean, they sure payed for it and they're all carousing, it's not like one guy's carousing while everyone else watches...

Sorry, for cold read "-What do you really want" was a suggested optional question for the move.

One thing I like about DW (and AW) is that there seem like a lot of legit ways to handle a common trope like this.  I like that flexibility.  Also, there's a lot of delight in watching a skilled *W user do clever or novel things with the mechanics.

You've spent literally hours honing your skills.  So, basically, you shelled out for a 2-hour seminar on winning friends and influencing people?

Use 'mark' instead of 'sucker'.

Nondetection seems really off-screen and narrowly applicable.  Consider making it a active thing the player can do rather than a passive protection that is most often moot.  For example, When you misdirect those who search for you, roll+int. On a 10+, you know just how to throw them off.  On a 7-9, while you may not be able to throw them off, you sure can delay them.

Slippery mind has the same problem as non-detection.  Consider a move that lets you know when others are up to something, e.g. When you follow the currents of influence, roll+Cha.  On a 10+, you know their con well, who their mark is, and whether or not it will succeed.  On a 7-9, you can easily separate the sharks from the minnows.

Cold read - what do you really want?

Play possom should focus on what you do, e.g. convincingly play dead, rather than what the target's actions are.

For cheat death, consider a reroll rather than using bluff - no modifiers to your likely highest modifier is a huge jump.  Consider an upgraded 7-9 option for last breath instead of having death figure it out at some vague time in the future.