Consider it this way. Putting someone in a choke hold using the chokehold feat gives them the pinned condition.
Like an MMA fighter doing a rear naked choke....Also some things I thought may be interesting...
Have your armor customized to hold an immovable rod that you can activate.
The "slick" property for armor to help avoid being grappled, although I don't know how the Strix's feats work for grappling.
Armor spikes...Holy(or anti-whatever alignment it is), Strix Bane, etc...
Ring of Feather fall.
I have a feeling though that none of this will help...seems like the GM is too in-love with his creation to allow you to ruin his fun any earlier than he deems it appropriate to the story he is telling, and damn you for trying to alter that by wanting to write your own heroic story.