I think it would be wasteful to build an entire gun if all it takes is a little machining on the one you have, to make it "stroked".
As far as the recoil spring goes, since your pistol is still pretty new, you probably have a 14# or maybe a 12# spring in it from the factory. Mine came with a 14# Wolff from the factory, when I had 1K rounds through it, I dropped to a 12# Sprinco and it made a huge difference in how flat the pistol shoots. In my experience, 1-2 pounds difference in recoil spring weight can make a very noticeable difference in how flat the pistol shoots. So, my point was, before I spent any money, I'd just want to know how the other pistol was sprung compared to your pistol. And there is no doubt Akai pistols shoot flat. Corey was shooting one on my squad at Cowtown and stroked or not, it was shooting very flat.