This build starts, as the title says, by making use of the two weapon fighting chain AND the startoss chain. It, hypothetically, makes use of this by way of the ricochet toss (RT) feat, and I just want to make sure that this is a valid method and determine (hopefully by RAW) what the penalties and benefits would be if this method is valid.
For the purpose of this hypothesis, im assuming ~level 11, access to imp. twf, full startoss chain to examine how the method operates. Additionally, only one weapon ( a chakram for example) will be used.
At the start of combat, swift action: enter startoss style and make a full attack against a foe within 1st range increment.
Make the first main hand attack, weapon returns via RT, second main hand attack and returns via RT, and potentially third main hand returns via RT. These attacks gain the +6 to damage from the startoss line of feats and will take the penatly to attack from the two weapon fighting line (-2, as the off hand weapon is unarmed strike, for now(?)).
Switch the weapon from main hand to off hand as a free action, and repeat the process for the two off hand attacks. These attacks obviously take the twf penalty (-2, I think as the main hand is an unarmed strike for these attacks, -4 if considering the main hand a chakram from earlier). But do the off hand attacks qualify for the startoss damage boost?
Links, and a build can be provided/made if needed.