I used to use one of these
https://en.wikipedia.org/wiki/HP_48_series
where you kept values on the stack and could reverse the values with the SWAP key. I currently have a
https://en.wikipedia.org/wiki/HP_Prime
which I use in Algebraic mode instead of RPN.
Does your calculator have a reciprocal button? That’d get you to the desired result with only one extra keystroke.
I used to use one of these
https://en.wikipedia.org/wiki/HP_48_series
where you kept values on the stack and could reverse the values with the SWAP key. I currently have a
https://en.wikipedia.org/wiki/HP_Prime
which I use in Algebraic mode instead of RPN.