Subject: Re: The good old days ...
I just sold a bunch of in-the-money BRK calls and bought April 17/2025 T-bills with the proceeds. I'm not sure what a US dollar will buy at that time, but I'll have 3.723% more of them. Annualized that's about a 4.97%/year rate.
Unless Berkshire's stock price falls, in which case I'll close 'em early and probably do the reverse trade.

Sounds reasonable. An easier option for US residents is to put the proceeds in short term T-bills which currently yield 5.3% with zero risk (though likely to be 0.25% lower soon) and wait either for better entry points back into Berkshire or look for other attractive alternatives.