Along with the ones listed the only other real potential would be House Banefort, historical 1st stop for all Ironborn attacks on the Westerlands. Since the Houses of Tarbeck and Reyne were put down, few current houses have ability to field a large military presences, nor would they be inclined to spend money on it if they could. As Rysy says most families are more concerned about making money off of their mines. Having a large military would deplete their work forces heavily not to mention the cost of logistics. Their for most Westerland lords are content to pay House Lannister to deal with the problem. This is how the Lannisters have a near near inexhaustible supply of funds even though their own house and the Crown itself is in heavy debt. They are running a protection racket basically.
NapoleonBlownapart
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Ive never modded before, I feel like, a blind man feeling my way threw a razor blade factory