I found an easy way to take out t-posts. I bought myself a good farm jack...
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Then bought an attachment specifically made to pull out t-posts...
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The Farm Jack with t-post puller attachment takes most of the work out of pulling up t-posts. I'm at an age where I was willing to spend some money on the equipment and save my back. Pulling out t-posts, even with a lever like you described, can still be hard work. I'm for less hard work at my age.
Speaking of saving work, I highly recommend using a t-post hammer to pound the t-posts into the ground....
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I bought my t-post hammer about 30 years ago and it's still like new. Much easier to use this t-post hammer than to use a sledgehammer, for example.