The RHP and light are both going to be inside of the lid, and the lid is several inches tall, so I'm hoping the lid removal won't be too annoying -- at least, not any more annoying than my current setup. That's good to know about the light -- I figured it would do that, but I'd still need something to counteract the temps at night. And that might also work to give a daytime temperature boost, since you'd expect it to be slightly hotter during the day than at night anyways.
If this works (and I'm thinking it will) I can probably lower the house thermostat down to 68-70F so we're not wasting so much power for one tiny snake lol. Like you said, complete temperature mastery! (68's still pretty cold to me so maybe not :/)
Either way, I'm planning on having Maze in the Christmas tub for at least 2 years -- which is about when I'm hoping to have gotten started on building her final enclosure. The RHP and UTH could possibly end up heating that as well, if I like them both and they last that long.
I'll keep y'all posted!