Here, this would get you going in the right direction, enough time to setup the GPS. (see attachment)

Somebody hit me with another one, I can draw it out too if you want. Preferably something with a larger difference in course.

I agree with the others though, don't accept a clearance you can't do. I would've at least asked for a vector from ATC to get me going in the right direction if I were in your shoes.