[Wrana]

There was an idea somewhere that pikemen could be represented by block units: i.e., 1 model representing, say, 4 pikemen and having Size 3, with #secondshape representing losses (3 pikemen unit having size 3 and 1-2 size 2). This would both protect them somewhat from tramplers and allow higher concentration of attacks against individual opponents (of any size). (this started as making individual pikemen Size 1 for better concentration, but vulnerability for tramplers was considered too great in such variant).
Another idea was to give them animal awe and make all cavalry of animal type (penalty they would get for sieges are thematic, but there is possible weirdness with some spell effects).