Lovely work but I think you’ll find that the additional side shields were a curiosity, peculiar to 8th Div in Malaya and to the various components of 23 Brigade, parcelled out to Timor, Ambon and Rabaul (Sparrow Force, Gull Force and Lark Force).
Photos of them elsewhere, including Borneo appear to show the shields unmodified. The gunners in 8th Div in 1942 would be wearing standard khaki drill shorts and shirts as per the desert war.
Here’s a 2 pdr in Borneo in 1945.