Viable, but not if your team tilts.

Why would this be viable?

most champ's are viable as support's tbh when it get's to lategame.

Red kayn would be great if ahead mid-lategames. Not exactly a top 10 support to choose tho.

Dude in early game he's almost completely useless and most of times if you play botlane you'll get blue kayn that means you're utility comes out at 18 mins... Idk

Peeling : bad
Engaging : bad (if you use R you let your ADC alone)

He's a good fighter, but bad sinergy. Maaaaaaaaaaaybe with Yasuo ADC

kayn not even good in his main role tbh

Let me translate OP for y'all

"I didn't get jungle as I demanded so I picked Kayn Support anyways. I knew it wouldn't work but I can always blame my team for my own shortcomings"

who?

Dude I’m a support main. Stop being toxic plz

There are probably 90% of champs who would be better support then kayne not sure why you would pick him.
Can it be viable sure but why gimp yourself?

Going to ask the real question here

Unlike all these spammers that need reported

Blue or red?