So an applique armoured version of Valentine with the 2pdr replaced by a .50 cal water cooled Vickers MG with a 'troop' of 1 Sentinel and 2 'Valentine Echidna' as a dedicated Japanese field fortification busting team has resulted. Depot conversions of Canadian-built valentines to this configuration would be done at Chullora railway workshops in Sydney, and there might be what, 50-60 during the course of the whole war?
It's obviously dependent on what's available locally, but hadn't we moved to 15mm Besa as the replacement HMG for tanks in the Light Tank Mk VIC? .50 Vickers would have to come out of stores somewhere (possibly naval?), 15mm Besa would be new production. In fact the 2 man,  radio equipped turrets of Mk VIs, whether with .50 or 15mm, are really begging for a practical use (though with only 4-14mm armour they would need some serious uparmouring)