Many derilects are being guarded by collections of tiny, weak, but cowardly redacted frigates. While these guardians may hold tiny amounts of loot, it is the static station that contains the valuables.
Their AI makes them kite for minutes at a time while harassing destroyers and cruisers, which makes no sense within the world when harassing a cruiser thousands of units from the derelict should have no affect on my fleet's ability to pull a mule up to the derelict, stuff all the goods in, and motor away to sort it. As long as my warships can escort the freighter in and out, this should be possible in-game.
Place the derelict probe or survey ship on the battle map as a capture point, under redacted control and ~1/6 of the map away from their starting line. This point can be captured either "by any combat freighter or freighter" or "any warship with 2x the cargo capacity necessary to hold whatever it actually holds", were it must remain in the point with 0 flux and not firing. If that ship is then retreated without being destroyed, the player can claim victory and collect the derelict's loot exactly as if they had completely won the battle (excluding drops from surviving redacted vessels).