The modified hazard switch should eliminate hyperflash and allow you to run LEDs with no bulb out errors, which is related to the brake lights too. As far as I understand it.
Like I said, I'm running standard halogen for the front turns, and LEDs in all of the rear sockets, including the brakes (which I'm using a special bulb from a specialty vendor for this car).
If I did it all over, I'd probably just do the hazard mod, or buy it, but my setup works great.
You may just have to test it out.
I did a lot of math and tested outs lot of LEDs and combos to figure out what triggers these cars. This with a unmodified hazard switch