I run the speedtech pro-touring subframe and faced all the issues you're mentioning. I wanted to use 5th gen Camaro Brembos rather than Corvette style brakes so I opted to use ridetech drop spindles over the AFX spindles.
I still ran into the same steering arm issue you mentioned, and overcame it by using shorter A-body steering arms.
It all works together, but take that very lightly, because for me, it has only worked rolling in my driveway, as my car isn't finished yet so I haven't driven it. How much the geometry is affected is still a little unknown.
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