Is it possible to replace a value that exists already in a select column?

I have a select column with existing values. I’d like to swap on value for another. I know I could filter the column and replace one by one… but is there another way to do it?

A one time option would be to filter, change the value for the first row, copy the cell, select all the cells you want to update and paste.
For something you want to keep doing use a button -