The first paragraph of SB643B states:
The following information constitutes the manufacturer’s Instructions for Continued Airworthiness and outlines required maintenance, inspection, cleaning and overhaul intervals of the TCM and Bendix magnetos and related equipment listed under "EquipmentAffected"
(my bolding).
Whilst it is a few years since I worked with Australian Rules, I cannot see how a LAME can get around that statement. Where I work that means I am obliged to comply with the SB.