Yes , (indeed that is what happened in the game I just watched) , and thanks for your in depth knowledgeIf referee allows them back then they may take the kick.
Time up on the sin bin or on the game?Red 10 is in the bin, and time is up
Red score a try
Can Red 10 come on and take the conversion ?
That is correct in law....if the referee lets the player rreturn then they are free to participate, ie take the kick in this scenario.Yes , (indeed that is what happened in the game I just watched) , and thanks for your in depth knowledgebut my question is : what is correct in law?
On the sin binTime up on the sin bin or on the game?
Should the referee let him back on ?That is correct in law....if the referee lets the player rreturn then they are free to participate, ie take the kick in this scenario.
Yes.Should the referee let him back on ?

Definition says "dead" is when the referee blows whistle to stop play eg surely when a try is scored?Law clarification 2-12, in relation to law 5.7(e), as it was, would suggest he can’t come on because the ball is not dead until after the conversion.

Do we blow to stop play when a try is scored? At that point the conversion clock is running so we’re not really dead, we are potentially after the conversion attempt (as per definitions), so that feels like a good time to allow subs, bun back on etc?Definition says "dead" is when the referee blows whistle to stop play eg surely when a try is scored?
Can’t disagree with you. It’s a messy situation. There are lots of contradictions within the laws, definitions and the clarifications. It seems to me that the only situation where the ball is dead is when the referee says it is. As per clarification 1-21 perhaps. I have to admit to being fed up and frustrated with the inconsistency surrounding this issue/topic for practically all my rugby career. And that’s a long time!Definition says "dead" is when the referee blows whistle to stop play eg surely when a try is scored?

I like this logic, and in the absence of any official direction on this, I reckon I wouldn’t let the carded player back until after the kick is taken.I think with the stipulation that the kick has to be taken “within 60 seconds (playing time) from the time the try was awarded” indicates that the ball isn’t really dead once we award a try. In that case the binned player has to wait until after the kick is taken or the 60s is used up.

Scrums & lineouts have stipulated time limits. Does that mean the ball isn't really dead for these stoppages?I think with the stipulation that the kick has to be taken “within 60 seconds (playing time) from the time the try was awarded” indicates that the ball isn’t really dead once we award a try. In that case the binned player has to wait until after the kick is taken or the 60s is used up.