Yes have done that and it works, however I have noticed that the vehicle used by Zoe in the video did not have the British Pudding and Tea added but the % still increased on further investigation it seems that the Improved Ventilation had been selected giving a 5% rise in all crew skills. On further investigation the Conq Gun Carriage, Bishop, FV304, SU 14-2, FV207, 212A and FV 3805
are the only Arty deemed to have an enclosed body/turret thereby qualifying for Vents. Perhaps its my poor eyesight but surely the two French Arty at tier 9 and 10 have enclosed turrets??