Another thought I had was does one consider the class to be more physically based or maybe for it to be more mystical.
If it is the former perhaps using the feats like brawl/ martial arts, improved brawl/martial arts, combat expertise or defensive martial arts, combined with standard soldier feats and maybe some feats from the links I provided in the above post.
If more mystical maybe use the feats and links in the sentence above maybe with maybe the soldier feat progression. So with a regular feat it could be the same but with formation feats the monk could get a BASIC sorcery school. Basic only as their focus can be seen as more as being in tune with one’s self as opposed to casting spells per se. Example the counter magic can be seen as the monks inner fortitude to resist magic, calm of the adept as being increased inner awareness, etc…