Note that there's a distance at which two J1s plus refueling at the far end is still faster than slogging through realspace. It's just quite a ways out.
In one of my ancient campaigns I had a house rule that jump was only safe if the entry and exit points were at a radius of between 100 and 1000 times the diameter of a nearby massive body. This allowed ships to come and go freely anywhere in very roughly the inner system of a star (around 1 to 10 AU from Sol, for example), and to larger planets in the outer system and beyond. The best available navigational tech would let you jump to an Earth-sized body's safe emergence zone. Typical merchant ships required something the size of Saturn. This made for more interesting twists in ship routing, military strategy, and so forth. E.g. getting to Mercury once you've emerged from jump would require a trip of around half an AU. Getting to a small Oort cloud object would require a looooong schlep through normal space, but you might be able to save time by jumping to a larger object "nearby" (by Oort cloud standards).