The I-nert's knight do you mean? It is closer to the looks of the actual knights and could be replaced in the Ad Mech as it was intended time ago. Many types of knights share the same pattern of suit which is the Questoris pattern (the common one). There are others which I don't know if they exist in models or if some 3d model has ever been made.
Lore wise, there are weaponless knight-like mechas called drovers:
A sub-class also exists called the Drovers who looked after the animal herds, as the nobility would not soil their hands with such work. The Drovers used walkers similar to those of their masters, but they were, by law, not armed with any weapons, despite the fact that they faced very serious threats in the form of predators and xenos raids. This forced the Drovers to rely on the Knights for protection, and created a dependency comfortable for the nobles, as it made revolt virtually impossible
I think the old model with big hands could be used for that role if there is such a necessity for a builder.
Besides, it's up to you if you want to focus on the Titans + ad mech with some knights or if the knights can be something on their own (besides, they can be featured in other imperial armies). Basically this is a choice between higher or lesser size and power. The scaling and progression is not easy but I found the subsystems activation a good thing to modulate the otherwise overpowerness.
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