I would say (and I would do without overhead landing gear lights)
step 1) recycle the landing gear. You will find yourself with Flaps 15 and the gear up for a few seconds, so you can make sure that the landing gear horn works properly. Anyway the horn sounds if one gear is not down and locked.
2) If the green light is still out, light test, as you said. If the bulb has burned, You have the solution.
3) Go around, change the bulb, and land with 3 green lights
That will make your insurance happy.
I think it is always better to burn 700 kg extra fuel for a go around than having to deal with a gear collapse pax evacuation
