Well I’ll add my contribution to this Tinker thread then lol
I think a science based healer would both be new/unique and fun.
My idea for this would be a Tinker spec called a Chemist.
The Chemist healer would have abilities that utilize things like gases, concoctions, cauldrons, injections, vials, mutations, chemicals and the main focus would be centered around blight, sludge, slimes and toxic gas clouds.
Things you see with the scourge, undercity and plague lands.
I written a more detailed exploration of ideas here…