Alright, think I've got a couple of my choices decided. Go with two keys for the enter key (regular enter, and regular "\", right?) or buy a single blank enter key cap from Imstro or Qtan (do they allow buying single caps, because if they do, I will be going with this choice).
Now, one last question. For the right shift key, it is a little smaller, would a caps lock key, or regular \ key work there? Not sure which, wondering if anyone has replaced them already and can lead me to some insight.
Because if this is so, I would wind up buying the following:
-Keycap set and key puller from wasd
-Custom escape key, extra caps lock key(for right shift, would this work?), and extra row 1 key (for "\" key)
-Custom enter key from either Imstro or Qtan (if they allow single key cap buying, checking this out now)