Free gear swapping and presets changed the game for sure.

Whats the demonspawn roster look like? 

The six most likely candidates.  I put Vulk in Bolster to give the team more time to swing on pack takedown on the Dueler boss.

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I still have work to do on Alure, but Magnarr and Fellhound are the only booked champs.

in *most* cases, high res and def can take the place of heal/revive in a pinch

Your post above mentions Lydia, so I assume you are working on Regular FW.  That Demons Roster should be more than capable of doing Regular FW all the way to 21.

If you have her, Tainix offers some pretty solid support in Regular FW.  Stack her with HP & Speed and she can keep you alive.  I did Regular Demons w/o a Reviver and used Tainix for healing....although I may have had Helicath by the time I 3-starred everyhting.  Don't really remember.

If you have the books, Lamasu, Vulkanos & Shazar are all worth booking.

Other Epics worth mentioning: Peydma, Nazana, Achak, Akoth.  If you have Achak, he does killer healing paired with Burners. 

Yeah id definitely recommend Alure for 21.  When I did it the 1st time I put my fastest gear on her and boss never took a turn.