I'd like to borrow the
blue kryptonite from Smallville .
The blue kryptonite of Smallville make Clark almost a normal human being.
Thank about the ways it could be used in L&C.
For example ensuring a safe pregnancy for Lois
Allowing Clark to be appear to be normal whenever needed.
Say as in "Top Copy" someone believes Clark is Superman. He opens a tiny lead pill container sized box in his pocket exposing himself to blue kryptonite picks up a pen knife and makes a small incision on his forearm drawing blood.
A Bomb with some blue kryptonite explodes and some blue kryptonite is embedded in Clark. All Clark knows is his powers are gone.
blue kryptonite in Smallville also rendered Clark immune to Green kryptonite. Picture him always carrying a tiny lead pill container sized box with blue kryptonite for use when attacked by green kryptonite.
Luthor imprisons Superman in the kryptonite cage. Either have Clark carrying the tiny lead pill container sized box with blue kryptonite or have the cage made of blue kryptonite.
And so on ....