From what you have described, your expectations for battery consumption and ease of replacement are on target. I wouldn't change the design.
Have you tried some of the pattern functions towards the end of the tutorial at:
The varying of colors has a somewhat dimming-brightening effect that I felt was really cool for the Neopixel. Worth spending an evening tying the different getPattern() functions.
Please post some pics when project complete or even as you go along perhaps.
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