My feeling is that they should be able to bring any of their previous positions or investment into their terms, but not exit or otherwise change them except int

My feeling is that they should be able to bring any of their previous positions or investment into their terms, but not exit or otherwise change them except into index funds. So let's say that prior to being elected someone's heavy into telecoms for some reason. Keep the positions! Keep them as long as you want. If you want to sell, go ahead. If you want to buy back in? Sure, but index funds only. There's still some room for abuse there but it vastly reduces the opportunity for abuse.