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Point of reference, all L series transmissions have the same first gear ratio. The lower the final drive, the longer it is. The Insight has a 1.0L motor and a 3.2 final drive. The Civic Hybrid (1st gen) has a 3.6 final drive and a 1.3L motor. The 2015 Honda Fit has a 1.5L motor and a 4.62 final drive ratio.
Or in other words, the Fit has a 1.5x multiplier on RPM in all gears when compared with an Insight and a 1.3x multiplier with compared with the Civic Hybrid, AND a bigger motor. Bot of these cars have motor assist systems so it's not a completely fair comparison.
Probably more fair:
2005 Civic HX - 1.7L motor, 3.84 final drive, AND a taller top gear on top of that. Plus this is a heavier car. So, I think you could very easily swap your final drive for the Civic Hybrid's 3.6 (assuming it fits) and it would be no more difficult to drive than a Civic HX.
A 3.6 FD would bring 3500rpm down to 2725rpm.
I'm personally putting a 2.0L or 2.4L motor in my Insight and going with an insanely tall 0.647 6th gear and 3.4 final drive, which will result in 2300rpm @ 70mph with the factory tire size, and 2200 if I go a bit larger in tires.
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