The Type 41 Mountain Gun had HEAT ammo produced from April 1943 according to my Japanese source, Below you can see some pictures from test firing the weapon:
FORTIFICATION POINT, NEW GUINEA. 1944-04-06. A JAPANESE 75MM REGIMENT FIELD GUN, PACK TYPE, MEIJI 41, FIRED BY MEMBERS OF THE 2/14TH FIELD REGIMENT AT THE FRONTAL ARMOUR OF A DISABLED MATILDA TANK FROM A RANGE OF 150 YARDS DURING TESTS ARRANGED BY THE OPERATIONAL RESEARCH SECTION, ARMY ORDNANCE CORPS AT HEADQUARTERS 5TH DIVISION. THE WEAPON WAS SERVICED BY MEMBERS OF THE 2/83RD LIGHT AID DETACHMENT. IDENTIFIED PERSONNEL ARE:- SX10807 GUNNER S. GERMEIN (1); SX9411 GUNNER W.J.M. HALL (2); VX52611 GUNNER D.B. OFFICER (3).
This might make a Nice addition to the Japanese, as a Premium or collectors kit item. Might be a new way to introduce kit to the game as a special Gun Crew section, with an engineer that can only build this gun.
A New Way to generate Revenue.