To answer your other questions: No, don't insulate the pole at the bottom with a sandal, and yes, you are overthinking this.
In the relatively unlikely (but possible) event that lightning does stike your tent pole, you want the current to be conducted to ground as easily as possible. If not, it might find other routes, like thru you. At best a sandal is only going to create arcing around the sandal to the ground. I don't see any advantage to that. At worst it will cause the current to jump from the insulated pole thru you on its way to the ground.
If you are in a lightning storm and lightning is likely to strike near you, there is nothing you can do to stop it. What you can do is to give it alternate paths to ground that don't include going thru you. A metal pole nearby will help, but only if it's not so near that it can conduct into your body or arc to your body in preference to conducting straight into the ground. A tall point that is well connected to ground provides roughly a 45° cone of safety. Put another way, you want to be closer to it than its height, assuming you're not adding significant height yourself. For example, being 20-50 feet from a 100 foot tree is about right. Further than 100 feet or so, the tree isn't giving you much protection. A 4 foot metal pole planted 30 feet away, for example, is useless as lightning protection.
The other thing to worry about regarding lightning are ground currents caused by a nearby lightning strike. The current doesn't just stop when it hits the ground, it fans out. Unfortunately, the ground isn't uniformly conductive, so it doesn't fan out evenly. There could still be subtantial currents running thru the ground 20 feet from a tree that got hit, for example. The ground isn't a perfect conductor, in fact it's rather a poor conductor most of the time. The large currents times the resistance between two points causes a voltage, which in turn can be large enough to zap you.
To minimize ground current danger, try to insulate yourself from the ground and minimize your footprint. The insulation make going thru you a higher resistance path than the ground, and the smaller footprint causes a smaller voltage accross the footprint for the same ground current.