I love the banneret as a concept, but I absolutely loathe the execution. The main problem of the original class is that Rallying Cry is not good until you reach higher levels and you only have one use of it, Royal Envoy feels more like a ribbon feature, and Bulwark is so specific in its trigger requirements that you may play an entire high level campaign and never successfully use it once.
With my rework, I tried to make the features more useful and their use more frequent, while also maintaining as much of the original concept as possible and striving to keep the class simple (without adding unnecessary stuff like a banner mechanic, warlord-like maneuvers or anything like that).
Art credits: Purple Knight by BryanSyme
Late response. Reason I haven't posted it is because I've been reworking parts of it I dislike, especially Rally and the subclasses, but there's an older version of it on the internets. I'm definitely keeping the directives though
Here's a preview