A better solution to this problem would, in my opinion, simply be to further increase the Honor to Recuitment Cap ratio. If at 150 honor (which takes considerable time to amass for most people) I can still only recruit 25 Cav/SF, most people aren't going to bother to recruit them at all, making them the playthings of the very honorable and Cavaliers/Heroes, and those class options come with major drawbacks (like losing all your region maintenance/looting buttons and that non-trivial chance of death in battle).
Making honor more important for SF/Cav is a good idea, IMO. For most people, hitting 4-50 honor is more than enough to hire all the troops they can normally afford. Only the people leading the TO unit, or the rich dukes, usually need the more honor to hire the size units they want.
