I am not sure how a Maxim buff could go well... so you need to buff OKW, or give them a real tool force maxims like Snipers or something like Sdkfz 251-Flamme. And OKW has problems versus MG even now...
snipers no... id prefer less snipers to more snipers thank you... but OKW could get a mortar unlocked by the first undeployed truck... it would be a decent anti MG tool... should also make it easier to deal with the vickers as OKW... granted you would still be melted by USF alive... single most lopsided matchup if ive ever seen one....