The role selection should be like that "tank, jungler, mid, adc, support" and there should be specific items for this role, a MUST GO and tanky.
I dont even remember what a frontline is, the last time I saw a frontline in my team, julius caesar and marcus antonius where fighting in a civil war.
As a support player you could opt to not play a mage support, and instead pick any of the tanky ones. You clearly don't want to play tanky supports, what makes you think top laners want to be subjected to only playing tanks?
If your team doesn't have a tank, then it is your team's problem that you drafted a bad team comp. Top laners shouldn't be forced to play tanks. Do you know how frustrating it is to play a full tank, then watch your 2 lanes and jungle lose? It sucks, and you don't have the damage output to kill any enemies.
Lane/role queue doesn't work like that.
