A wind beam is usually incorporated into an external wall, as shown in the data sheet here https://ftmanews.com/wp-content/uploads/Tech-Talk-Ed.5.pdf. It sounds as if your design is using a glulam stair stringer as a wind beam. That would require careful structural design, which is beyond the scope of our service. We were also unsure about the reference to the wind beam as a 'sacrificial timber beam'.

The Australian Standard you need to comply with depends on the type of product, for example solid timber, LVL, I-beam etc. Whatever type of product you produce it would need certification to be accepted in the Australian market.

The only ‘standard’ we know of with regard to wire brushing wood is the one published by the Norton company. It nominates five grades of abrasion, ranging from coarse to very fine, depending on the diameter of the wire.

Radiata pine isn’t prone to checking under all circumstances. For example, kiln-dried pine in a stable environment, such as pine furniture kept indoors, isn’t likely to check. Checking occurs when pine (and most other timbers) are exposed to rapid drying while they have a high moisture content. As timber dries it shrinks.