I see no reason why that procedure wouldn't work. Especially if you're willing to have some flat "keeper tabs" fabbed, to hold the rear seat mounting to the floor.
Personally, I've taken it one step farther when I installed my racer boy seats, by drilling the spot welds/rivets to remove the rear mount, thus lowering the rear of the rails all the way to the floor. That gained about 3/4-1" IIRC. For my application, that wasn't enough...so I scribed a line parallel with the floor, from the top rear of the slider to about 2-3" fwd on the bottom of the slider rail. Then I got out the mini grinder & cut a pie shaped cross section from the rear of the slider, lowering the rear about another 3/4".
Then it's just a matter of fabbing some keeper tabs that'll hold down the rear.
They need to be shaped like a big keyhole, so the skinny part can overlay the very center indent of the slider rail, & the round part will go under the bolt head.
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