How to shoot Diamond Fuji

So this January and February I want to shoot Diamond Fuji.

This opportunity only lasts a few seconds about 11 times a year from the lake I want to go to. I will only be off work for 1 of those.

I thought about bracketing, but I'm not sure if there is time for that. What tips do you have to capture this huge dynamic range? I won't have time to readjust settings once the sun is at the peak.

Thanks, sorry if this should be asked under the weekly thread but I felt this was unique enough to merit a thread. Feel free to delete it if not.