The reason the game is using the Clansmen as the deafult unit is often (but not always) because they are listed as first as ALL_FACTIONS recruitable. In mods that specify precisely factions the rebel faction (FN_REBEL) ends up with Ballista and Trebuchet and peasant armies often and this is perceived as a bug - in many cases its not - its because the modders neglected to put enough units to the Rebel faction explicitly (specifying it as FN_REBEL to gether with the others in the factions association column) or implicitly (specifying ALL_FACTIONS ie including the REBEL one for those units).
If you see the orgs list of tools there is a crusader unit editor available for download. Havent used it myself, but i know that say in the MedMod Crusades were always about two stacks size and had Crusader specific units only - so it can be done.
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