I actually really like these idea's; very well written; but unfortunately it isn't going to bring the explorer's into open.
Exploration is generally low hazard due to the distance travelled from civilized space; so I wont argue about the risks of being interdicted on the frontier.
However there are significant risks when returning to civilized space to hand in your exploration data; some of which could be weeks or even months of real game time. To lose it all by having your lightweight (and often slow) explorer blown up by some player is simply not worth going into open for; the risk to reward ratio when entering civilized space in open can't be plotted on the same graph.
The problem with exploration is that it is a monstrous time sink in which a single death means the loss of all that time and effort; I realize that traders/miners can lose a huge amount of money with a full cargo load, but I doubt that it would take weeks to recover from the loss of a single death.
The fact that they have the most to lose, also makes them a great target for those griefers as you are obviously going to get the best response from them. Really easy to spot as well, paint degrades due to the large distances travelled exploring systems, so an explorer ship that is heavily 'weathered' makes for a juicy target indeed.
I've actually thought about it myself to try and find incentives to bring explorers into open play; For example doubling the financial rewards for all exploration data collected and sold while in open (with a single switch to solo resetting the 100% bonus to'exploration data collected in open', or even at the extreme end, you lose your data); although as an explorer myself money isn't a particularly great motivator (it pays very poorly anyway, so I doubt many explorers do it for the money).
If something can be done to help mitigate the data losses that explorers face on a single death, and bring them to the point where they hurt but are not devastating; then open might start looking like a worthwhile option with a few well thought out, fair open-mode exclusive rewards.
For example (I admit this idea isn't particularly well thought out, but just an example):
Friendly player groups in open that carry some sort of long range 'remote cartographics module' that could meet you out in the black and allow you to sell your data for a percentage of your profits (an adjustable rate that both parties agree on); these 'brokerage' groups could then contract friendly fighter wings like Iridium wing for protection creating some interesting and I think enjoyable experiences (eg Player friendly commanders protecting the explorer and the remote cartographics ship while they sell data).
You actually seem to have rather good ideas; and I generally like the direction you are going with them. I mean even griefers would probably love to have more targets in open, so getting more players into open is really a win for everyone.
Just need some more ideas to appeal to the greed of as many player types as you can and I'm sure you will get great support
