Be able to compress minerals into bars? Why not?
One tritanium bar = 1,000 trit. Guess it should be a blueprint and it would take some time+cost some isk to create? And then a blueprint to uncompress it again. Who knows.
Basically the problem is that you can ship a ton of ore to a reproccesing plant but when you reprocess it the volume gets out of control. So perhaps there should be a way for players to compress minerals. Obviously if you carry a ton of compressed minerals you will become a gank target so theres a tradeoff its not just an easy button.