[help request] Re-Add dead and dropped NPCs

Is there any program or method of modding in which I can re-add an NPC who has died and been removed from my party so I can raise them from the dead?

Obviously it's impossible to do a raise dead spell on somebody who isn't in your party, making it impossible to add them back, kind of a catch 22.
Anyway, I tried raising the hitpoints of "out of party characters", among other things, in shadowkeeper, but to no avail.

Any ideas?