Thanks for the nice comments on Finns.
Starting from the Winter War(11/39) Finns formed different Taisteluosasto (Combat team or -group, in German that would be Kampfgruppe) by taking infantry unit (size from battalion to regiment/brigade) and assigning different support units (SU's!) to it in permanent or semi-permanent way. For example: summer -41 Osasto L (Lagus) was formed by taking 1. JPr (Jager Brigade) and attaching to it one (and only) Finnish armored battalion, Motorized AT-Bn (the only one), motorized engineer Bn and extra artillery. The first three were with brigade almost a year and then were included to the armored division at the time of it's forming.
Therefore, I think that Finns should be able to assign SU's to Div (x3), Brig (x3) and Rgt (x1) on the next batch. Other Minor Axis I am not familiar enough to give exact info, but I feel that they should be also looked into.
Nobody respects a country with a poor army, but everybody respects a country with a good army. I raise my toast to the Finnish Army.
Attributed to Josef Stalin, 1948.