Requesting the feat Skill Knowledge from UA (from pg 81), which I realize I will need after Namo pointed out the issue with the skills in my build.
I highly doubt a feat to get a specific skill as a class-skill will cause any issues, but I will ask anyway. Once that's cleared up, I'll recalculate my build's skill expenditure.
As an aside, thank you again Namo. I found that thread too, but Move Silently seems to be an especially challenging skill to obtain without dipping a class.