About the only thing you could possibly do, would be to put in a call to PTE and request that the new technology for a "TA" series Buick turbo be put on their to do list. Not sure if they have components and backing plates for the new technology wheels yet.
One thing you gotta remember is, you are very limited to what can be fit inside the Garrett TA series compressor cover without getting into some serious modifications. (IE: boring it out past the casting, then welding it up and refinishing the compressor cover. Like some have done in the past with fitting larger than 68mm compressor wheels.)
Then again, this might be something that is already on the to do list at PTE.
Turbochargers and turbo development are like crack, you feed them a little, and they want more. And the addiction never ends.
Patrick