"which makes this whole part of the plot feel like the writers are shoveling events just so they lead up to the pre-ordained result." - This is exactly what it feels like. It really makes no sense why he would do all this for her.

They wanted to use Ted Kord but they couldn't DC didn't allow them

Why does Wes care about Rebecca? He has been nothing but nice to her and she has been an absolute jerk to him. She has like no redeeming qualities.