You can always give everybody with a polearm a Free Dice on their init roll (or anybody with a reach bonus or missile attack bonus above +6 say)
Generally I err on the side of swiftness and speed of gameplay rather than include every possible detail, but I don’t think that would be too hard or complicated to implement. Best rule of thumb is start simple, and then once the players are up to speed and start asking questions, you can start to layer in the nuances.