The laid back seat post might be the answer, a little more legroom but still can get up on the pedals. You'll have more reach to the handlebars but that might be a good thing.
On Karate Chicken Industries Orange bike, see how the BMX bars are situated forward? Plenty of room to stand and pedal. A laid back seat post might work well on that bike, if you can get one in 13/16ths.
The lowered center of gravity is good as long as you can shift your weight, as Matti stated. On a recumbent it's different, it has little flexibility when it comes to shifting your weight. I don't like how it feels like you're on the very edge of falling over on those bikes. No way can you ride with no hands on a recumbent. You can't turn to look behind you because it throws off your balance. I had a Bike E recumbent that had the seat a little higher but still wasn't a stable ride. The pedal forward design is similar to that, but not as pronounced. Good for leisure. The best riding bike is the classic over the pedals design. I think that's why the geometry hasn't changed that much for a hundred years.
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