My method is slightly different from yours, although almost the same.

I usually just use an enclosure (tub in a rack) and put it back in the rack, so it still gets heat (my room is nice and warm anyway 80-86F), and i leave them in there over night. I've never had any problems with this method at all.

The reason i use this method is because i've used darkened out water bowl/hides in the past and my royals have chose to sit in them for 2-3 days at a time when they were in shed. Even if i moved the royals out, they'd go straight back in there after about 5mins of me returning them.