There had to be people out there. People that had dealt with this particular problem before that could offer their advice on how to stay hidden from those who would seek them out. Certainly, Han would do anything and everything within reason to help his son be free from the darkness that seems drawn to him. They just aren't the kind of people he would associate with. Or perhaps they were right there all along, letting him believe that the force wasn't real. Either way, how would Han know if any of his contacts were hidden Jedi ...

Alternatively, and the only advice that the elder Solo could think to offer is ... don't use the force. Don't use it ever again. Surely the more you wielded it, the more clearly your enemies would see you. But that was the only answer that could make sense to someone like Han. And it may not even work, besides.

The third option and it's one that would never occur to Ben's father, would be to find a Holocron or even several of them. Han wouldn't know what they were, where to begin searching for them or even if he was looking right at one.