Is it permissible to eat in a place that serves pork, given that its isolation is guaranteed, and it is difficult to leave the place? And is it permissible to enter a bar for purposes other than drinking alcohol?

It is not permissible to sit in a place where there is an evil unless there is a necessity. If eating pork is in a distant place where the evil is not seen, then your presence and eating are permissible. If that is not possible, then there is no harm in being present while disliking the evil in your heart if you find no alternative. However, sitting in a bar where alcoholic beverages are consumed and music is heard merely to drink soda is not permissible.