It would have to be something very public so that everyone would know he died. If he was just knocked over the head and dumped in a ditch at the side of the road during the his travels nobody would know he died except for the apostles and his resurrection would not be quite as impressive in the eyes of the public.
Maybe a straight up public assassination while he was speaking in front of the multitudes outside of the temple in Jerusalem would work. Or maybe getting “mistakenly” beaten to death by a roman doing crowd control. Had to be something public.
There’s no limit to man’s imagination so there’s no limit to the responses you may get… however, there’s a specific reason why the Word, God, Became Incarnate… and only for this purpose does He Become Incarnate:
5 Therefore, when Christ came into the world, he said:
“Sacrifice and offering you did not desire,
but a body you prepared for me;
6 with burnt offerings and sin offerings
you were not pleased.
7 Then I said, ‘Here I am—it is written about me in the scroll—
I have come to do your will, my God.’”
8 First he said, “Sacrifices and offerings, burnt offerings and sin offerings you did not desire, nor were you pleased with them”—though they were offered in accordance with the law. 9 Then he said, “Here I am, I have come to do your will.” He sets aside the first to establish the second. 10 And by that will, we have been made holy through the sacrifice of the body of Jesus Christ once for all. (Hebrews 10:5:10)
Since it was required that Jesus gave up His Life there’s no scenario that cannot include Jesus’ Death on the Cross–as for prophecy, all had to transpire according to them since they are Yahweh God’s Revelation.
Maybe you don’t, but your question does. It asks us to consider that God didn’t know His own plan of salvation (and therefore, would have had to have found “another possibility for Jesus … had Judas not betrayed Him”).
You’re asking whether there’s a plausible “Plan B”; and that implies that God would have had to have had a “Plan B”, not being sure how His “Plan A” would turn out. It’s a reasonable question to ask a person, but not of God. :shrug: