Hi hi!!! I am familiar with the KH series so I can say definitively that Replica Riku wouldn't be affected, sadly. The Copy Chip is really complicated and has a lot of bullshit magic science, but the gist is that Axl can only take and use a robot's "DNA" (don't ask man), so it doesn't encompass all artificial beings.

RIP pls Replica it's just a name!! And he doesn't have the e in it!!!!

I'm unfamiliar with Saiyuki though :(