It it were up to me (and thankfully for all concerned it's not) I'd replace the current system with a more dynamic one.

Basically as it stands there are giant rocks in space that contain a single ore type. These rocks are placed together for form belts or in scannable sites.

I would replace the individual ore rocks with a single "Asteroid" type. Each asteroid type contains a percentage of each of the ore types. The asteroids in high sec contain a much lower potion of the good ores, and the asteroids in null sec contain a better ratio of the good stuff. Low sec can go fu... i mean low sec contains a more balanced level.

Now this would be complicated further to make it more fun! The T2 mining crystals would allow you to pull out a greater portion of the ore you're after at the expense of wasting the ores you're not.
The server would track the total of each ore mined in a region and when downtime rolls around and the ores are respawned then the ore percentage balance that the newly spawned rocks will now contain will be adjusted by what was mined over the course of the last few days/weeks.

So for example, in a high sec region right after this goes live it's fairly obvious that everyone will be after the better ores so they will fit the T2 ark crystals and mine away. after a few days of this the percentage of ark in the high sec belts will be low enough that the return on mining this will be less than switching out to another crystal. Rinse and repeat.

This should create a steady source of the low ends in null sec which can be balanced so that importing from high sec is still required but a concerted effort to get them locally would be possible.

The base percentages could be regularly balanced to ensure the market is operating the way CCP want, i.e. export of high ends from null and import of lows from highsec.

Btw, the asteroid scanner would tell you the total m3 of the roid and the percentages of the various ores it contains.