I'm just questioning the math a bit.
Runner on first steals second sure, he's on second. Runner on first, hitter gets a walk, runner ends up on second and you have a runner on first. Seems worse.
I don't doubt the number your provided, I think it lacks a bit of context since it's dependent on other things happening (the hitter getting on base initially and the runner succeeding in his stolen base attempt).
What's the expected run value of a stolen base attempt? Do they have that listed?