That all sounds great! And I am totally fine with spoilers, so hit me. (Likewise, how do you feel with Allen? Although he's amnesiac and with how slow canon updates any possible spoilers with him are well over 2 years old, lmao.)

Regarding getting ambushed, Allen has a cursed eye which gives him a slight edge on realizing someone is there since it makes him extremely sensitive to highly corrupted beings/places and beasts to the point where he can "see" it. Could help explain how they get ambushed, but not enough to get kidnapped the traditional way. Exorcist powers, man. For once they come in handy in a game. :')

Also, I can't wait for Deku to offer himself as the blood sacrifice in the end. Because Allen would freak and protest that so strongly and it'd be great to see two self-sacrificing types clash on that haha.