Viable Smite Support?

Obviously it is acceptable for Ivern to take Smite as a support, or in any lane for that matter.

My question is, are there any other champions that would make particularly good use of taking Smite while laning in the position of a support?

And of course this almost invites the whole Singed Support controversy to show it's ugly face.

I suppose my question has more to do with wanting to know the specific benefits and potentially gold value that could come from taking Smite on specific champions and being played as a support.

If any...

My thoughts actually are around things like, when might it be better to take as opposed to ?

Could someone like Bard make better use of this because he does have a tenancy to roam for chimes?

So could roaming supports potentially pick this instead, or is Sightstone and it's upgrades still better than Tracker's Knife and it's upgrades in any situation?

And of course there are things like taking Skirmisher's or Stalker's for their respective Smite variations.

The additional Smite on the team could help to secure/contest neutral monster objectives.

Smite can be used on minions (although I'm not sure if this would really be helpful on a support)

...

And once again, I am willing to accept that it may simply be widely accepted that Smite simply isn't good on any other support.

I am actually fairly confident that Riot would actually prefer it that way.

I am not necessarily trying to make this a 'new meta strategy' but I wanted to open a discussion about it to see what the community thinks.