The figures I've come up with to represent these uncouth but strong warriors are Gaels from I-Kore's old Celtos range of fantasy miniatures. I like these figure because first they wear kilts not loincloths. So many fantasy figures are sculpted wearing loincloths the peoples of Middle Earth don't wear loincloths! Second because the Celtos range has a equal amount of female warriors in their unit packs. The Celtos figures don't seem too bulky next to the GW LOTR figures to me.
From left to right GW Last Alliance Elf. Celtos Gael, Mordor Uruk-hai, Celtos Gael
Again the Last Alliance Elf next to several Celtos Gaels.
Here you can see that I have two full war bands of Hillmen with a mix of spears, 2 handed weapons and hand weapons with shield. The shields have not been attached in this picture. You can see the Hillwoman captain out in front of the warbands I believe I have another captain and possible one more full warband of Hillmen unbased in my lead pile. When I say warband I'm using the term used in the GW LOTR SBG where units are called "warbands" a grouping of 12 troop models lead by one hero model for a total of 13 models per unit.