If they've mastered the basics there's no reason to be afraid of twisting with thin spokes. It's just something to be managed. A simple method is to lace the wheel completely and pre-tighten to minimal tension where it has shape. At this point there shouldn't be enough thread friction for twisting, and/or you can stress relieve the rim to allow the spokes to untwist naturally. Now spin the wheel and hold a waterproof felt tip marker so it just touches the passing spokes above the nipple. That'll leave a reference line on each spoke that can be referenced for the natural untwisted orientation of the spoke.

Spokes can then be untwisted either in batches as the wheel moves through tightening stages, or near the final stages as each nipple is turned.