Here's a thought:
1 x command strip
5 x arquebusier strips
5 x crossbowmen strips
5 x halberdier strips
Buy three packs and you've got 3 different units and a few spares to, say, add to character stands. Not so much variety but the size of your range of figures quickly increases from 2 unit types to 5. Unless you want to offer discrete units of the 3 different types. Whichever, doing it this way, your range has expanded.
Or maybe you make two moulds, one with the 3 x 5 strips as above and one with 15 (different?) command strips? The command strips can then be used with whatever you produce in future, or be sold as hero strips.
Perhaps you could do this with cavalry as well, mixing different types in one mould?