While neat, that would overlap a lot with the medic upgrade already on the same building.
But a medic halftrack upgrade for the 250/1 that removes the MG and transportation capability would be interesting.
Actually, just add an upgrade able 250 halftrack that can get one of three upgrades:
An MG that makes it the WH 250/1 halftrack.
A mortar that makes it the WH mortar halftrack.
And a medic upgrade that allows it reinforce and deploys two medics that heals individuals. This would make it not quite as good as the USF ambulance at healing, but more durable encouraging its use farther up the field.
Maybe can design a Special support 251 Halftrack for OKW,limit 1 but not use population and got deploy ability,when deployed can reinforcement .when T2 unlock medic,this HT got heal aura like USF ambulance.when unlock engineer in T3,deployed add 3 repair engineer.After build T4,this HT can be retreat rally point like major