You do not have to remove a spindle to replace a broken lug bolt. Just remove the hub/rotor assembly, that is where your lug bolts are mounted (from the back side).
Safety 1st. Jack stands, e-brake, tire that came off, under radius arm as back up. Make sure the lock in/out allen head screws heads are very clean, you do not want to strip them. If you do, no need to panic, drill the head off and keep on working. Remove the shaft with vice grips once the lock in/out is off.
Ok so after you take the lock in/out off......FYI this ia a walk thru for my son inlaws 76 Bronco with a F250 low boy D44 axle that the PO cobbed under there, but should be the same as far as taking stuff apart. So bear with me, it also has a 5 lug knuckle swap.
Clean off the outer bunch of grease with spray brake cleaner. There should be a snap ring (a pick and a 90* pick comes in handy here) in the outer edge part of the hub. Use a ratchet strap to keep the hub from rotating as you try to get under it and remove it.
And then remove the snap ring on the end of the axle shaft. Snap ring pliers for that one. Look for a small phillips screw in the inner locking mechanism. Remove it and a gear and spring should come off.....
Next remove the inner locking hub mechanism. You can thread 2 of the lock in/out screws as handles. Then it should come out as an assembly. Depending on your axle and or internal or external lock in/out set up you should have a spring and a large geared ring come off. No worries some one will come along and correct me.
Then yes use ever socket you want, or rented from the parts house that has that tool rental program. I am partial to the old 1/2 drive expose 4 point. Now is the time to take pics and pay attention to how the rest comes apart.
Remove the outer lock nut 1st. Make sure you are pushing straight in with relative force to keep the pins in the 4 grooves of the outer nut.
Once it is loose, thread it off and remove, then use the picks again to remove a washer (with a lot of holes in it) next. Then use the socket again on the inner nut. Once removed, PAY ATTANTION TO WHAT SIDE OF THAT NUT FACES OUT. LOOK/FEEL FOR A SMALL PIN STICKING OUT TOWARDS YOU. Remember that side (with the pin) faces OUT come reinstall time.
With all that removed the hub and rotor should have some play and start to come off, be ready to have the outer bearing come off (in your lap, or on a shop towel), as you pull the hub/rotor assembly off. The bearing races are pressed in the hub and should not come out.
Remove the hub/rotor assembly straight off and FYI the inner wheel bearing is retained in the back side of the hub, by a tap in seal. More on that later.
Tap/hammer out bad lug bolt, install new, carefully tap it a bit to get it started straight, then I stack some washers on the thread side and use a open end lug nut and impact to draw it down and get it fully seated.