1 ) Improve the healing of soldiers by a medic so that the medic not only restores their health, but also adds missing first aid kits to the inventory.
2 ) How often do you leave a medkit box on the battlefield? What if you always leave it? I suggest making it so that when a medic dies, an unused medkit box remains next to his body. Perhaps with fewer medkits inside.
3 ) Add the ability to take medics into non-medical squads. As far as I remember, there was once such an option in the Pacific campaign.
Assault squad example
MG squad example
Engineering squad example
I managed to find one non-medic squad in my group that could be expanded with a medic.