Perhaps your outlook on life needs more adjustment than your body does right now.
Depends on how you program it, how intense your workouts are, set/rep schemes… everything is relative. I deadlifted once per week for a long time, and had great results. Now, I fare better when I deadlift once every 2 weeks. You may do well with twice per week, 3 times per week, once per week… no way for me to know. You’ll have to actually give things a try, for substantial periods of time, to see what works for you.
That may be the best grip for developing grip strength, but it will also limit your ability to develop back and leg strength. It sounds like your priorities are all over the place. I thought hamstrings were the priority? Now it’s grip? Or do you just want everything all at once? lol. Here’s something to consider: when you’re deadlifting heavy, you can deadlift double-overhand until your grip is insufficient to continue to increase weight. At that point, you can mix the grip, or add straps. I prefer straps because double overhand increases the risk of bicep tears. Don’t be a fool for the sake of ‘deadlift purity’. If you REALLY want to be a deadlift purist, why are you lifting barbells? Why not lift heavy stones off the ground instead? That’s a more pure form of deadlifting than barbell work. My point here is that your line of where deadlift purity exists is quite arbitrary…
There have been world record deadlifts set without a belt. So no, belts are not necessary. I find them to be a useful cue for bracing, and I often teach people to brace simply by putting on a belt, filling their belly with air, and not even lifting a weight. Just feeling that physical response of pushing into the belt and holding it. Belts are a great tool, and I think it’s more intelligent to use them. They are anything but a crutch. If you can deadlift 700 lbs with a belt, you are strong. Belts do not create weaknesses in your body. They are not a substitute for a strong back. My lower back and hamstrings are extremely thick and strong, and I always use a belt to deadlift.
Straps are useful on training days when you want to save your grip strength for another lift. For me, I perform all my deadlift training with straps, and then I do heavy carries without them. So, I get the best of both worlds. I CAN deadlift 600 without straps, but I don’t usually want to. I’d rather conserve that energy for other things, to get the most out of my overall training.
PED’s are not necessary for anyone to get strong. At your size, if you really pushed yourself, and stay healthy, you should be able to approach a 700 lbs deadlift without PED assistance. If that’s a goal.