Fill = Support?

Unlike most players, I enjoy playing support. I also like playing a variety of champions in other roles. I would love to fill in ranked but, it will place you in support role 50% of the time at least. I wish Riot implemented a role security feature where the game promises you a different role every game until you play at least three separate roles.

example: support, jungle, top, support, bot, mid, support, top, jungle,..

An example of what my match history looks like in the current state of the game: Support, support, top, support, bot, support, top, top, support,..

Also, I wouldn't mind supporting every other game if on the off games i'm guaranteed my main role... not sure if this model works either...

What do you guys think?