Topway Dreamcast Controller Modding

[GothamR]

I recently purchased one of these controllers with the intent of messing around with it and seeing if I could wire the Slow and Turbo buttons to function as L & R. It feels pretty good for a 3rd party controller, but the problem is I can't figure out how to get the triggers to activate when pushing another button. I've done this with other controllers (modded a Retro-Bit Saturn controller to work on a PS1/2), but I'm having no luck with this one. Here's pics of the PCB. (I've already made some marks on it from testing things)





Anyone had any experience with doing something with this or the very similar NAKI controllers? I'd appreciate any help.