Hi Teddy,
I think the key to what you're trying to achieve is selecting multiple keyframes and adjusting all of their values by the same amount at the same time. You do this by selecting all the ones you want to change, making sure the Current Time Indicator is over the top of any one of the keyframes, and click-dragging the kayframe value to increase/decrease all of the selected keyframes by the same amount.
I've recorded a quick screen capture showing me rearranging 5 Sure Target targets from 1-2-3-4-5 to 1-5-2-3-4, moving the associated keyframes (so the timings are maintained), and then adjusting the keyframe values to keep them running in sequence.
Hope this all makes sense and solves your problem, but let me know if anything doesn't make sense.
Cheers,
Phil