So of Germany's continental allies, it seems the Hungarians were the most capable overall.
The Italians had some potential, but were mired with organizational failures, while the Romanians and Finns lacked manpower and industrial capacity.
So, with a POD no earlier than 4 June, 1920, what's the strongest performance the Hungarians could have given for the Axis.
Bonus points:
Seperate TOE retained, shared calibers allowed.
Viable production of a "domestic" medium tank by June 1942.
Hungarian units not subordinated to German commanders (Hungarian formations may be taken for multinational armies or army groups, but as much as possible, her participation is to be one of cooperation, not subordination).
Does not pull an Italy or Romania.
Additional notes: Hungary-wanking allowed within reasonable limits.
Politicians may be made partial to lead paint lattes, but may not have drastic changes to personalities or temperaments.