It would be so easy to implement and would be something that could be a challenge depending on what the modifiers are. Lets be honest, most of the 315-320 players can do the raid in their sleep with a competent fireteam. Adding this might spice things up a bit and add another way people could get that last item they need to reach 320.
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I think they should make a 310 NF (current light level till raised in april then raise it accordingly) Make it like the old style where you wipe it an orbit return. Then make the bosses drop all legendary gear only at 300-320. and the rewards for completion are 310+ but the modifers are 6 of them instead of and gaurteed of fresh troops and epic.