Gloomblade starknife thrower

[Trisagon]

Hi everyone,
I am trying to build a Dex Gloomblade fighter which uses starknives as his main weapons and he's able to throw them efficiently. I read a lot of threads about Gloomblade weapon training and his interaction. For this build in particular I would need Ricochet toss, but I am not sure I can take it by RAW. For now I came up with something like this, but I am open to suggestions.

1 Weapon focus (starknife)/Weapon finesse/Quick draw
2 Starry grace
3 Skill focus (Stealth)
4 Weapon specialization (starknife)
5 Owl Style
6 Gloomstorm
7 Owl Swoop
8 Greater weapon focus (starknife)
9 Iron Will
10
11
12 Greater weapon specialization (starknife)
13
14
15
16
17
18
19
20

[PossibleCabbage]

I'm pretty sure you can take ricochet toss. Unlike the question about a gloomblade's eligibility for advanced weapon training, ricochet toss is a "weapon mastery feat" which simply requires weapon training... which you have. Even if your GM is being very strict, martial focus is an option.