I really hope these happen. That giant sword HAS to be used by someone somehow, ideally and especially Kid ofc! Have you seen this theory post on Reddit per chance btw?
https://www.reddit.com/r/OnePiece/comments/4gfwhz
It mentions Kid using a railgun technique but also "induction smelting" which could be such an awesome, strong and useful powerup for him.
There's such INSANE potential with his DF and I still have some hope especially after this chapter that Oda will realise and showcase it for us. Especially given the insane creativity Oda has in the first place ofc!
I'm not sure if Kid has Punk Vise in Pirate Warriors 4, I'm going to assume he doesn't but it would be so great to use it one way or another in a game! Would be nice if they updated his moveset for the game if he doesn't have it but I'm not hopeful that they'll do that.