In fact, this is the most obvious and successful option for changing the Assault Guards. M5 is unnecessary, give Bazooka and Thompson updates to transfer to 2CP or 3CP if there is self-healing. This will make the Assault Guards really useful and remain in the Lend-Lease theme.
Another option that I have always considered is to replace the Guard with access to allied racks. Maybe with a little overpayment for balance. In theory, any weapon that was in the Allied racks (except 1919A6 which cannot be taken without a commander) was in the USSR.
Yes,I think Lead Lease can be more special like UKF new assault commander
Replace dshk by .50HMG(maybe dshk should for more commander)
Still M4C
Assault Guards rework be change skin Airborne
Fuel support or Repair kit replace by Ambulance(maybe Zis Truck like new OKW Opel)
Maybe will make this commander more useful