Hey cardude, do you have a car that you love? Or several?

I hope you can focus on your health and get things checked out and fixed up.

Many years of $600,000 withdrawals, 10-11 years in cash (only being 15% of your portfolio), 2% spend all make it sound like you are doing very well and have a lot of safety built in. Berkshire also has nearly 40% of its market cap in cash. Does any other company have that? I also trust their accounting to be more conservative than most.

I'd look into some stress management practices because it appears that you are in very good financial shape.

You could consider combining your #3 and #1. Maybe sell 6% of your Berkshire each year, spend the 2% that you need to live on and put the other 4% into SPY or a split of SPY and more t-bills. If you do this from 62-70 before you take SocSec you will have transferred ~32% over ~8 years to SPY greatly reducing your 1 stock risk (eventually). SocSec should further reduce your risk.

If you can't get over the worry, maybe increase year 1 and 2 to get 10-20% transferred sooner. At 10% per year you could have 20% moved by January 4, 2027 but I don't think Berkshire is going to implode THAT fast so I would probably take a slower approach with the markets looking like they do at the moment.

Good luck.