Just make partisans a bit more flexible imo.
2 upgrades for normal partisans
Give Partisan a 5th man similar to cons at T4. +1 Model, -Reinforce cost, +RA (both in and out of cover to reflect their role as more than just cover sitters). Maybe give them tactical advance ripped from airborne or stormtroopers, to reinforce their role as "all gank no tank" infantry.
Give Partisan an upgrade for 60 muni (or 80 muni) that replaces their PPSHs with guard Mosins (Or Gren Kar, whatever is balanced) and a LMG of some descript (Be it DPs or LMG42). Locks out the 5th man upgrade, gives them cover bonus similar to Cons or UK Inf (dependent on balans), maybe even the suppressive fire ability ripped from US airborne? It also loses the Molotov, because long range troop now.
The 1st one makes them scale. Less likely to get booped by HE and a bit stronger.
The 2nd one change their engagement profile so if the enemy goes all-in on strong CQ inf, they don't have to fight them head-on. They should still 100% lose against grenadiers in open field battles, but they should win if they use their 1st strike bonus/ abilities properly.
