A system like this is just to unnecessary given the dynamic of Duty Finder. The amount of players who enter DF who actually say to themselves, "I'm geared enough where I"m ok with switching if needed" is pretty low. It's easy enough to find people on this topic who say they will do that however you are the minority.

First of all DF, you enter it on the job that is best geared, so instances like Alexander Midas, wouldn't exactly work to well because the odds of having someone in the group who has an IL comparable to their best is pretty low. Keep that variable in mind, not only are you hoping for a person out of the 7 or less left to want to change, but to also have gear that will make them competent enough to stay alive or deal enough damage. It's just not worth the effort to implement when you take into account that only a handful of people would ever truly make use out of it.