I did a Pantheon jungle running summoner specialist, and I found that once you buy the starting jungle item, you can swap smite for ignite or exhaust. This is because the exp is attached to the item, and not smite itself, I found myself keeping up in levels early on although the clear was a bit slower, but I had the edge in ganks with ignite and exhaust.
Might be useful for farming carries to duel? I haven't tested what happens if you wanted to upgrade the jungle item without having smite, gonna do that right now on Yi.
Edit: Seems to be a bug on the champ select, I was last pick but did not select a ban intentionally (apparently bans don't work anyway as someone in my Pantheon game said he banned Pantheon). I got kicked from queue after the ban phase ended.