Best way to have an item that converts blocks into a variant of said block?

Currently, I have a tool that changes some specific blocks into their variants when you right click them. As of now, this works in a way that feels just a little bad, which is a long chain of if statements checking that the blockstate is a specific one, then playing the break effect, and replacing the block, like so:

This is annoying and time consuming to set up, but I can't think of any other way to do this. any ideas?