Thank you for your detailed analysis
The Maxim can barely hold 1 squad charging frontally, so 2 squads or more aren't going to be stopped.
OKW blob with a pair of Obers in the mix will simply decrew your teamweapon before suppression apply, in fact once vet2 Obers, even alone, will almost always win vs HMG unlike behind green cover. (the contrary to what you propose)
Pair of Para LMG are also able to decrew an HMG before it suppress. Ans obviously once your dual BARs your rifles they most likely going to brute force an HMG frontally.
A blob of 3 LMG gren is also able to take on a HMG.
And that's probably also the case for UKF in some way but I never play them.
Now there are blob and blob, but the game is old enough for the majority of players on the top200 to at least know how to focus fire the gunner. Then with minimum micro you can spread your units a bit for maximum effect.