Bring the Rorqual to HS.
It would take the smallest amount of changes to the Rorqual and it would be a highly viable ship again.

All it would take is letting it com into high sec and travel in and out like a Jump Freighter.

It would yield the following results:

1. Would reinstate the Rorqual to its rightful place as the Crown Jewel of the miners progression path.
2. It would actually allow the Capital tractor beam to be useful
3. It would allow corporations to use the Jump Clone Facility and get members jump clones rather than have them have to leave the corporation and join another to get clones and then come back.... because of the FUBAR standings requirements. This would fix what is now a work around to an onerous and broken mechanic.
4. Allows for mobile compression. Again, the idea of having to drop a POS and run it for an hour to compress ore and then turn it off again... is just another ANNOYING non game enhancing workaround. Make the Rorqual use fuel blocks for all I care... but it can move and compress with the mining fleet.
5. This would boost a flagging capital ship industry which is on the ropes since jump fatigue
6. Would drive trit and low end mineral prices down, which could possibly push the sagging high end mineral market back up and helps make null sec capitals less expensive. (.10 change in trit prices basically changes the price of a dread by 20 mil or so)
7. Allows for some protection of mining fleet in the belts from gankers. Does not prevent it of course, and with all the other top slots running, allows only a few spaces for remote rep units. But it gives some protection.
8. Allows for the transportation of an entire mining fleet...miners can be more nomadic. Can function as a mobile base of sorts.
9. Encourages miners to join groups that can field this force multiplier -- encouraging more social interaction.
10. Of course corps that actually field one would be much more juicy war targets, but meh, there are work arounds for that.
11. Will not interfere with the role of ship carrier that the Balloon Head will take.
12. It will be the first ship in the miners inventory without a glass jaw.

This combined with Fuzzy Steve's ideas of prospecting and/or other peoples suggestions of more random grav sites, this would add some much needed content to the mining profession.

Finally, yes isk per hour would drop for those without access to the Rorq,....but meh, adapt or die.