Thank-you for the advice! I actually already have some coco husk/chips on hand from a package deal I got for my cresties ages ago (it came with coco husk, coco fibre, and forest moss, and I don't use the chip/bark-type bedding for my cresteds), so knowing I can use that makes things even easier. I was worrying a bit about him possibly burrowing into the clay, but the excavator clay hardens up quite a bit and I don't think he'd be able to nuzzle in. Regardless, I'm getting it out as soon as possible lol.
I can get the new hides tomorrow, meaning I'd be able to switch everything out over the weekend and have Viago on proper substrate with two new hides. However, I did plan on trying to feed monday evening. Should I wait on changing his enclosure till a few days after I feed?
Edit: Also should mention the in-tank thermometers I have are both zoo-med digital readouts, one on the hot side and one on the cool side. The hot side is currently sitting in that giant half-log and the cool side probe is measuring the ambient temp, it's wrapped around one of the decorative branches about an inch and a half off the floor. I've read that probe placement, especially on the hot side, is important in accurately measuring temps. Should I move the probes at all?