Is there a place get to get smaller space keys with the same profile and color for this set?
As far as I know, not the same exact profile, MG is pretty new, but SA is pretty close. I don't think you'd notice a difference visually if you had an SA key mixed in with the MG. But from the quick search I just did, I couldn't find any individual SA keys in a pink color. So, as far as i know, you are probably going to have to settle for a smaller, more common, profile. Or maybe get a matching colored resin space bar? Personally, I don't think the space bar being a different form is going to make a big difference.
What size key do you need exactly? I'll keep a eye out and let you know if i come across something.