Sorry to hear that.
You might consider getting a shorty kicker like FRP has. That makes it quite a bit easier to start for a number of reasons. It's easier to reach cuz it's not 'up' so far on top, and it's easier to reach cuz it's not 'down' so far on the bottom.
The 'ride a bit' before setting the sag maybe isn't a bad idea...but it's not a matter of mile and miles. Beside...just cuz you set it doesn't mean you can't reset it a month later. It's unlikely it's way out of whack off the showroom floor, but parts of an inch make a pretty big difference.
There's an added reason to change the pullrods. The increased length increases the amount of shock travel for a given swingarm input. It makes the shock action more linear to swingarm travel. I believe both the koubalink site and the devol site mention this.
Note that if your on the edge of 'correct' for the shock spring (say 190+) rate, a longer pullrod will exacerbate that issue. You could conceivably be needing a 5.2kg/mm shock spring. You'll know that by the free sag (bike on its own) measurement after you set the race sag (normally to 100mm/4" or so).
I run my fork tubes even in the top clamp (cap sticks out). Tried them higher. Didn't like it.
Another large advantage (sez me) to the devol rods is they are much easier to assemble. Being thicker they sit easily on the shoulder of the kx250 bolts (they being longer). The oem stamped steel rods do not fit so easily, especially after a lube job when the seals are full of grease.
Beside that, they sure are purty!!
If you have to rest up to heal up...do it. No reason to be a weenie due to some discomfort, but don't rush something that MUST have time to heal.
.....more sez me......