I like all of these options, though I'd also say another thing they could do that would be incredibly easy would be to just remove the Solo requirement. If they're going to force people to grind difficult content with nebulous drop rates and relying entirely on luck, the least they could do is allow us to do it with friends.
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Losing the solo requirement would be a good change. I would settle for no change except changing the ghost mods. Letting us socket 2 types of the ghost mods at a "minimum 15" level would be ideal. Make one socket the "top" stats (class abilities: Mob. Res. Rec.) and the second socket "bottom" (neutral abilities: Disc, Int, Str). Minimum 15 Resilience & Minimum 15 Discipline would go a long way to controlling the worst part of the RNG. I wouldn't even care if the ghost mods took 5 energy each.