converting throttle plate bolts to socket type

[K2e2vin]

Alright, these are Suzuki ITB's, I'm trying to take out the throttle plates to modifiy the shaft. The screws in there are philips button head type. Anyway, I can't get them out without stripping the head(it gets half-way out then just starts stripping). I used a screw extractor to get them out. I want to convert to a hex socket type bolt but don't know which style would be good for a throttle body: Button head style or a low-profile cap sytle? Mike B, Cal, can you guys chime in?

 

[CRX-YEM]

Button Head Socket Cap Screws

 

[97hatch]

dont forget to reinstall with locktite you can only get them half way out because the first few threads are damaged from the factory after they are installed to prevent them from backing out