EDIT: Also there is a closer JH: in omega-5 I think, the omega-3 JH is within sight range of another one (<2.5k=ridiculous)
However, from personal experience the NPCs from each area know where the jumpholes are (except for some added in discovery but not updated into rumors) and are sometimes willing to sell their location. I think it would be fair to say that a patient, personable trader or special ops would know the routes where they operate, and if they needed something would feel comfortable taking them, as long as they were on friendly terms with BHG. (I've tried open-SP as unfriendly with them; they're EVERYWHERE... and incredibly stupid, as the link shows)