You could use a scenario where Monmouth did surprise James II's forces and maybe if some of the West Country's Militia regts joined him, my own bases for Monmouth's rebels have a mix of figures with, pikes, muskets, pitchforks and scythes, all on the same base, also if you want to expand your project into this period 1685-1691 the Royalist forces can be used for the Jacobite wars in Ireland and Scotland, and possibly recycle Monmouth's Rebels as Irish, possibilities are endless
book
General Percy Kirke and the Later Stuart Army by John Childs ( who has written many other titles covering the period)
cheers Old John