I do think that the Clone Kane does want Lena to go into the shimmer and become anew, because I think og Kane views Lena and their marriage as if they are one. And it’s clear Lena feels guilty about the affair and wants to fix the relationship.

Something I wasn’t quite paying attention quite to as much the first time: I knew the cup of water with their fingers refracted was very symbolic of how the shimmer refracts everything. But if you look SUPER closely when Lena reaches out and touches Kane’s hands, their hands aren’t just refracted from the water. Lena’s hand is mirrored in the opposite direction, making it look like she’s stroking her own hand. I think the film very much implies that Clone Kane definitely wants Lena to venture into the shimmer and become anew - whether it’s for reproductive reasons I’m not sure.