Perks tree is a great way to add back old removed abilities

Say you play revenant and you level up to lvl 2 you can then choose if you want silence instead of shadow leap or want to improve the existing leap ability and on level 3 you can choose death totem to replace forged shadow etc… Also if you pick silence your class would be changed to assault so it’s interesting now because you can play 2 classes with 1 legend.

As for lifeline basically the same protocol, on level 2 you can choose old shield revive to replace combat revive passive, Stationary DOC that heals multiple legends to replace current doc tac, And for level 3 I have an interesting idea, She can can choose a new ultimate over her existing one, She can basically call in a care package but it has an aura similar to limelight R-301 which heals everyone inside it as they deal damage to enemy teams, Really reflect that “Combat Medic” title.