I did it on the 75 300D I had many years ago so I knew it would be a major upgrade, but you don't really realize it till you've experienced it.

I kept the loop plugs and other than the one they look like new. Given that it took a while to track down adapter plugs, how hard is it to remove the loop innards from the loop plugs, remove pencil innards from some standard pencil plugs and swap them in?