I get them to play bunker shots with a square stance and square clubface with the handle even with the leading edge.

I find recreational players try to hit bunker shots like tour players (very open stance very open clubface) without great strength and speed this is difficult. I get them to play bunker shots with a square stance and square clubface with the handle even with the leading edge. Swing towards the target line. Don’t cut across. A high bounce SW helps.