Tubeless Tyre Repair
The "Correct" way of doing it would be to replace the tire.  All of the methods you mentioned are just patches and not foolproof methods of permanently fixing a tire.  If the tubeless sealant successfully stopped the initial flat and you aren't slowly losing air, it should be fine and replacing the sealant should be a sufficient measure.  Anything more and I'd look into replacing the tire.  I have never seen a puncture small enough to be sealed with latex develop into something bigger.