you could probably even just write a script for that in like less time too, put all of the existing properties for instances on roblox inside a table, then loop through the table and check if the target class has that property and just check if the last class has that property, and then you copy it to the new one and bam!
that’s the simplest way I can think of, there are probably even more efficient ones, but you get the idea.
I get his whole “price your work thing”, but like bro really be selling a glorified script i can build for 15 dollars. 
Also I do not dislike elltob, i actually like a lot of his plugins, I bought InCommand and Volumika because I really felt like those were worth the price and loved them.