An easy way to add an epic version of the Shroud:
Step 1) Epic difficulties, don't change anything, just up the difficulty accordingly the same way its done in many quests with an epic/heroic version.
Step 2) Epic Greensteels. Like heroic, the same ingredients drop in every difficulty level, but its a new set of ingredients. All these ingredients do is let you add augment slots to your greensteels, which also raise the ML to 20. Just the ability to add 2 or 3 augment slots to your greensteels could more than make them relevent again at endgame.
Also, with Epic Completionist coming out, a set of Epic Greensteels suddenly becomes useful as well. Just look at regular greensteel pre-MOTU; you have to be at our near cap to make it, but its ML12, its designed to be TR-twink gear. Epic Greensteel can get the same place: 8 levels from cap, overpowered at level, but give the epic shroud such a high difficulty you'd need to be 25 or 26 to get through it.
And the Shroud lives another day!