I started out playing Napoleonics in true "old school" style with 48 figure units (although they were actually 50-54 figures).
The infantry were organised as 4 "companies" of 12 figures each plus a battalion command of 2-6 figures (officer or two, standard or two, and possibly musicians). But we all liked to mix our chosen units so to max things out we might have the 4 companies painted with 4 different sets of facings.
Cavalry regiments were 28 figures for heavies and 32 figures for light, organised as two squadrons, but most of us had very few cavalry.
That may not help your predicament, but there are ways to bend any set of rules.