Rifle Company shouldn't get callin infantry. Its a doctrine about RIFLEMEN after all.
Give it Riflemen field defenses, reduce the flare and fire up prices by 5 munitions each and call it a day. Literally just making the abilities cheaper would fix this commander. The debuff on Fire Up is so fucking bad theres no way it should be 15 munitions, and the rifleman flares should be priced equally to the panzerfusilier ones.
If someone seriously implements actually removing or replacing these abilities with more non-riflemen garbage ill be bloody pissed. Doesn't need elite infantry or more tanks or whatnot. Even carbine upgrade sounds iffy. I wouldnt mine replacing the RE flamethrower with Riflemen molotovs though; right now Urban Assault Company is a far better boost to RM effectiveness than so-called "Rifle Company". Ditch the RE rifle nades though.
While giving it Riflemen field defenses, but lay the mines down in a reasonable period of time. They're so slow that they're almost worthless. Let the riflemen build tank traps also.
Fire up shouldn't have a debuff. None of the axis one's do, IIRC.
The only other thing I would add is an off-map arty that is the same as the old Mechanized one. This would help them greatly in larger team games while keeping the actual theme about rifles. Maybe make this call-in tied to the rifles, similar to Pathfinder arty.
One other possible upgrade would be to give it the option of the equivalent of the G43 upgrade, maybe even with aimed shot that could snipe one model - even if the aimed shot ability cost muni's.