Good grief. Try not to be such self-parodying stereotypes. Unless Trump does something that can be identified as an attempt to influence, it’s really not a gigantic problem. If you have a president who’s been involved in _anything_ other than jobs paid for by the public, this is always a concern, and the fact that he (or she) puts the business in a blind trust doesn’t change a thing, since foreign leaders and businesspeople are going to know what businesses the president was involved in and will be involved in again, in a couple of years. It’s not like it’s a mystery no matter what.
You want to avoid this, just never elect anybody who has any ongoing business concerns or any ties to business at all. That’ll narrow the field to hardly any. Because finding good presidential candidates is so freaking easy to begin with.