Just reiterating and developing what I've already mentioned:
I suggest we add a tier three 'Spear Comitatus' as a heavy spear line infantry, and a 'Sword Comitatus' as an able bodied group of swordsmen.
I'd quite like to see their fear/ambush style of play continued as well, so perhaps some form of axe-wielding skirmirsher unit which can hide anywhere, and maybe even a similar archer unit, which has limited range but high attack and can hide anywhere, perhaps with a spear as a secondary weapon? These could compensate for the lack of Burgundian cavalry as flankers (I think they should be with the Burgundii, where they belong!) and increase the infantry focus.
I also think we should keep the lombardi units, although perhaps as an AoR to which the Alemanni have extended access in the regions along the Danube to the west of their starting position, including the beserkers.
Finally, some form of 'Alemanni Veteranii' available in post-Roman regions, which is essentially Roman Veteranii. Perhaps half unit size and double HP or something. Just some form of shock unit, acknowledging the Barbarian presence in late Roman armies.
Them hording sounds like a workable idea too, to prevent them being squashed by the Franks.
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