Monastic Training, Tashalatora and Flowing blade feats does 1000 better than Atavist and since these are available Monk feats at first two leves you only need to spend Flowing blade as Soulknife 3 feat on and advance Soulknife to get AC and speed bonus and (greater) flurry with the Mindblade, someting like this (not optimized):
Monk 3 / Soulknife 8 / Kensai 4 / Someclass 5
Now, you could go Soulbow build and point monastic training and tashalatora to soulbow:
Human or Lesser Assimar
Monk 3 / Soulknife 3/ Ranger 2 / Soulbow 1 / Kensai 3 / Shiba Protector 1 / Soulbow +7