I agree, I could add a default setting for each family of elements.
In the meantime, for certain repetitive actions, history commands can be used to repeat them. History commands are records of all user actions (Edit → Edit History).
There is no possibility to change the history commands (they can only be recorded). Then all unnecessary commands can be deleted (select entire row, Delete key). And then the command history can be saved to a file: in the Edit Commands window, select File → Save As. Be careful not to save the changes in the commands of the model (deleted commands) using the OK button. Exit the Edit Commands window by selecting the Cancel button.
Now you have a file that you can run using File → Run History File. There are limitations to using such recorded commands since they reference the items that existed when they were recorded. The items should exist in the model tree. Parts should have the same names… But in your specific case, to change the element type of a fixed number of parts with constant names, it should work.
You should get a handle on it before using it on a real model. Make a copy first!
There is a weird limitation that at least two commands must exist in order for PrePoMax to save the history to a file. A bug.