That’s a good approach too. But again, you’d have to explain how Boba knows they’ll be sent to the Sarlacc. If you don’t, then you’re left to infer just as much as you would be if you didn’t try to explain Boba’s plan to capture Luke in the first place.
You could just expand my initial exchange to give Boba a little more leeway.
Vader: Skywalker will come for his friend, Captain Solo. Bring him to me.
Boba: …If he survives.
Vader: I want him alive, bounty hunter, if possible…
Boba: As you wish.
I will admit that my ideas are a little biased toward Boba as a man of few words because I want both a Morrison or Wingreen option for his voice.
Obviously anyone can try and tackle this idea if they like it. But I do think I’m going to avoid using any modern footage for my own approach.
EDIT: I also wanted to add that I appreciate and am enjoying everyone’s input so far!