This is just a simple datapack that removes the tedious task to break and replace villager's workstations.

Use:
Place an item frame on top of your desired workstation and place in it a book renamed "Cycle".
Now, given that the desired villagers is in a 2 block radius, when you step on the item frame it just pops a new villager on top of the old one.
Be sure to step off the item frame or the cycle will just continue.
This mechanic is safe to use around villagers you already traded with.

Or you can run the command:

/function cycle:villagercycle

Installation process:

Download the file .zip file
Extract it's contents in your datapack forlder inside your world file
type /reload and make sure that a message pops up

More info:

I've added the possibility to disable the functionality and only use the command since it could cause some lag on low end pcs; for that check the README.txt file inside the folder.