I would think heavier springs and heavier fork oil (possibly even added oil to stiffen the "air spring").
To stiffen up the front end of my tiger, I added a heavier weight oil. With the stock springs it is fine for my weight (230). The shock on the Tiger had enough preload to get it where I wanted it.
I am a 99% street rider, so this worked for making my bike a little 'sportier.'
Physics are the same, so this could work. It is a cheaper option.
Kent's suggestion is similar to how I set up my sport bikes. Straight rate springs are how I have always done it. Never wetn with Cartridge emulators, but I have had front ends redone by KyleRacing, Thermosman Suspension, and BigValleyHonda. For my race bikes, I have been happy with the results and confident it was money well spent.
For the KLR - if being used for just fun riding, it may just be over kill.