Yay!

It's doable!

I need One pin at a minimum of 245Khz, and then the other pin at a 1:4096 ratio.

As long as that one pin is over 245Khz, I'm happy.

(Detail warning)
Basically, the chip I'm controlling has 16 PWM outputs, each with 4096 brightness levels. You serially clock in your data, and then feed it the aforementioned pulse train. That pulse train makes it step through the brightness levels, and then the single pulse resets the display chip. I need a minimum of 247Khz, as I have to update the display 60 times a second, and with 4096 levels, thats 60*4096Hz = 245Khz.

Thanks SO much for helping me with this!