What are your ideas on getting the public to widely use half dollar and
dollar coins in everyday transactions?

I think the following would work:

1. End production of Kennedy halves in 2004. The last year should have a
special date, 1964-2004. Starting in 2005, the half dollar would have a
portrait of Martin Luther King on the obverse. The words "United States
of America" would be in big letters above the portrait. The word
"Liberty" would be in smaller letters positioned on the obverse. On the
reverse, there would be the rendering of the Liberty Bell that was on
the reverse of the Franklin halves. Above the Liberty Bell would be the
words "Let Freedom Ring."

2. Starting in 2005, remove the portrait of Sacagawea from the dollar
coin. Replace it with a portrait of John F. Kennedy. The design of the
Kennedy dollar coin would have a new portrait. The reverse would remain
the same as the current Kennedy half.

We would then have MLK Halves and Kennedy Golden Dollars.