no he's going to be turned to ashes by ZnT's heat if he doesn't use Blut Vene. He can't gain immunity to ZnT. The only thing Askin can do is stay away from Yama, so at least he can avoid East.
Gift Ball will vaporize before it comes into contact with Yamamoto. Yamamoto can just keep out of Gift Bad's range or use South to wreck the ground. And if Askin's blood doesn't vaporize before he could take it into his body, Yama can still use North to erase his face from a distance.
His Vollstandig won't let him fare better either.